The primary issue presented by this appeal is whether the trial court applied the appropriate measure of damages for the breach of contract to convey real property which included a provision governing the interest rate payable on the assumable loan covering the property. The defendants Parker contend that the contract involved was a simple contract to convey real estate and that the damages, if any, should be awarded under the rule of Lane v. Coe, 262 N.C. 8, 136 S.E. 2d 269 (1964) and Johnson v. Insurance Co., 219 N.C. 445, 14 S.E. 2d 405 (1941). That measure is basically the difference between the contract price and the mar*602ket value of the land. Plaintiffs, on the other hand, contend that the method for computing damages when the breach of contract results in a change in interest rate set forth in Pipkin v. Thomas & Hill Inc., 298 N.C. 278, 258 S.E. 2d 778 (1979), and applied by the trial court herein, is the only measure of damages which will provide adequate relief under the circumstances of this case. We agree.
As the plaintiffs noted in their brief, the issue is one of first impression in this jurisdiction. However, we may be guided in its resolution by general principles of contract law. The general rule for the measure of damages for a breach of contract “is the amount which will compensate the injured party for the loss which fulfillment of the promise could have prevented or the breach of it entailed, so that the parties may be placed as nearly as may be in the same monetary condition that they would have occupied had the contract not been breached.” 3 Strong’s N.C. Index 3rd, Contracts, § 29.2, citing Perfecting Service Company v. Product Development and Sales Co., 259 N.C. 400, 131 S.E. 2d 9 (1963); Childress v. C. W. Myers Trading Post, Inc., 247 N.C. 150, 100 S.E. 2d 391 (1957).
The general rule that has been applied to determine damages recoverable for the breach of a real estate contract is as follows: “[T]he damages recoverable for breach of contract by the vendor to convey real estate are only such as may fairly and reasonably be well considered as arising naturally — that is, according to the usual course of things —from such breach, or such as may reasonably be supposed to have been in the contemplation of both parties at the time they made the contract, as a probable result of the breach. The loss of the vendee’s bargain is assessed upon the basis either of the difference between the contract price and the actual value of the land, or the actual value of the land less the amount, if any, remaining unpaid on the contract price. . . .” Johnson v. Insurance Co., supra, at 449-450, 14 S.E. 2d at 407. “The measure of damages for breach of contract to convey land is the difference between the contract price and the market value of the land.” Lane v. Coe, supra, at 15, 136 S.E. 2d at 275.
In Pipkin v. Thomas & Hill Inc., supra, the court first observed that a borrower’s claim for damages resulting from a lender’s breach of contract to lend money is “primarily cir*603cumscribed by the rule of Hadley v. Baxendale, 156 Eng. Rep. 145, 151 (Ex. 1854),” and then summarized the following general principles of recovery:
This rule limits generally the recovery of damages in actions for breach of contract. To recover, a disappointed borrower must not only prove his damages with reasonable certainty, he must also show that they resulted naturally — according to the usual course of things —from the breach or that, at the time the contract was made, such damages were in the contemplation of the parties as a probable result of the breach. Additionally, the borrower must demonstrate that, upon the lender’s breach, he minimized his damages by securing the money elsewhere if available. When alternative funds are unavailable, however, the borrower may recover the damages actually incurred because of the breach, subject to the general rules of foreseeability and certainty of proof. (Citations omitted.)
298 N.C. at 284, 258 S.E. 2d at 783. The court then quoted the following formulation of the rule governing the applicable measure of damages from the Restatement of Contracts § 343 (1932):
Damages for breach of a contract to lend money are measured by the cost of obtaining the use of money during the agreed period of credit, less interest at the rate provided in the contract, plus compensation for other unavoidable harm that the defendant had reason to foresee when the contract was made.
298 N.C. at 285, 258 S.E. 2d at 783. The Pipkin court concluded that the measure of damages for a breach of contract to borrow money is the present value of the difference between the interest payments owed at the interest rate specified in the contract, and the interest payments actually owed as a result in the breach.
Clearly, the rule of Johnson and Lane does not properly fit the factual situation in the case under discussion. Johnson and Lane each involve a failure to convey the real property which was the subject of the contract to convey. In such cases it is entirely appropriate that the measure of damages would be the difference between the contract price and the actual or market value of the property. That is because the use of this measure of damages *604when there is a failure to convey property restores the aggrieved party with the “benefit of the bargain,” and places the parties in the same position monetarily as they were in prior to the breach. To apply such a measure in the instant case would overlook the nature of the breach and the result of the breach of contract on the plaintiffs’ monetary position.
Defendants Parker primarily argue that Pipkin is inapposite, but that if the Pipkin rule controls at all, the plaintiffs may not recover because they failed to demonstrate that upon the lender’s breach, they minimized their damages by securing the money elsewhere, if available. We disagree with both contentions.
The common thread in cases determining the measure of damages upon the breach of any type of contract is the goal of placing the parties in the same monetary position they would have been in had the contract not been breached. In this case, the breach involved a change in the interest rate on the loan from the 8%°/o rate which was set out in the real estate contract to the higher rate of 91/2% per annum. A change in the interest rate on the loan does not fully affect a party at one time, but rather continues to affect a party over the entire term of the loan during which the change in interest is in effect. The damage to plaintiffs here arises from the additional costs of purchasing the home over the term of the loan. In order to return plaintiffs to the promised monetary position, the court must look to the change in the interest rate and the effect of that change over the term of the loan on the plaintiffs.
In Pipkin, the court articulated a method for computing damages when the breach of a contract results in a change in interest rate: the appropriate measure is the present value of the difference in the interest rate set out in the contract and the interest rate resulting from the breach of the contract over the term of the loan. The rationale behind the Pipkin measure is clearly applicable to the case under discussion.
Plaintiffs unquestionably suffered a foreseeable monetary loss as a result of the breach; they requested and were promised an assumable loan at an 83A°/o interest rate and they ultimately received the loan with a 9V2°/o interest rate. Defendants’ own witness admitted that the differential in interest rates would affect the cost of money used to purchase the home and, in turn, af-*605feet the total purchase price of the home itself. Further, that a house purchasable at 8%% interest is more attractive to a prospective buyer than a home purchasable at 91/2°/o. Therefore, defendants’ own evidence as to damages establishes plaintiffs’ loss and lays the foundation to apply the-Pipkin rationale to measure such loss. By combining the general rule of damages for breach of contract and the rule set out in Pipkin for computation of damages when the breach causes a difference in interest rate, the present value of the resulting economic loss of the plaintiffs over the term of the loan can be computed and the plaintiffs placed in essentially the same monetary condition that they would have occupied had the contract not been breached.
Returning to the issue of mitigation of damages, we conclude that plaintiffs’ failure to secure an 83A°/o loan elsewhere does not stand as a bar to their recovery for defendants’ breach. In Pipkin, the lending institution itself breached the contract with the plaintiffs. In this case, the breach was occasioned by the actions of the real estate agents in the preparation of the Offer to Purchase contract, and in their failure to disclose the “problem” with the interest rate on the loan which was to be assumed by the plaintiffs. Rather than contact the lender with whom plaintiffs had no direct dealings, the plaintiff, Patricia Starling, on several occasions contacted the real estate agent who handled the sale of the property and by whose contract the 83/4°/o interest rate was promised. The real estate agent gave plaintiff assurances that the matter would be looked into and then took no, action. Although the evidence indicated that residential loans at 83/4°/o were available during April and May of 1978, it was during these particular months that plaintiffs were attempting to remedy the problem with the interest rate by contacting the agent for Harold Parker Realty Company, and were receiving assurances that it would be looked into. During this period it was the inaction of the defendant realty company’s agent, not the inaction of the plaintiffs, that resulted in a failure to obtain favorable refinancing.
The trial court made findings of fact and conclusions of law to the effect that plaintiffs made a sufficient effort to mitigate the damages arising from the breach of warranty contained in the contract by contacting the agent regarding the increase in the interest on the loan. Under the circumstances of this case, we find *606no error in the court’s findings and ruling on the issue of mitigation.
Plaintiffs’ witness, Professor Burke, computed the damage to plaintiffs by determining the difference between the payout over the term of the loan at 83A% interest and that at 972% interest rate, and by then discounting that amount to a present value. Based upon these computations, and taking into account the standard deviation, the trial court awarded a judgment for the plaintiffs against the defendants Parker in the sum of $6,200, which was the minimum figure presented by Professor Burke. Defendants Parker do not contest the accuracy of the computations.
Under the facts presented, the findings of the trial court and the general rules of contract law, we conclude that the method of computing plaintiffs’ damages was proper and was accurately applied in this case. Accordingly, the plaintiffs are entitled to the damages awarded by the trial court.
Defendants Parker also argue that the conduct of the plaintiffs in contacting L. H. “Bill” Taylor, the real estate agent who handled the sale of the property, and who was an agent of Harold Parker Realty Company, constituted a waiver of the contract term related to the 83A% interest rate. We need not directly address the issue of waiver, however, because defendants failed to raise this affirmative defense by their pleadings required by law.
It is well established that waiver, or the facts constituting the basis thereof, must be specifically pleaded. Cantrell v. Woodhill Enterprises, Inc., 273 N.C. 490, 160 S.E. 2d 476 (1968). G.S. 1A-1, Rule 8(c) provides that “[i]n a pleading to a preceding pleading, a party shall set forth affirmatively . . . estoppel . . . waiver, and any other matter constituting an avoidance or affirmative defense.” This defendants have failed to do, and they may not raise the issue for the first time on appeal.
We have carefully reviewed defendants’ remaining assignments of error and find them to be without merit. The trial court applied the appropriate measure of damages in this case, which is the present value of the difference over the term of the loan between the 83A% interest rate, which was contained in the contract, and the 972% interest rate, to which the assumable loan was raised. Plaintiffs’ conduct in attempting to mitigate their *607damages was adequate under the circumstances of this case. Accordingly, the judgment of the trial court is
Affirmed.
Chief Judge Vaughn and Judge Webb concur.