Section 50. Performance in manner or at time prescribed or sanctioned by promisee

50. Performance in manner or at time prescribed or sanctioned by promisee .—The performance of any promise may be made in any manner, or at any time which the promisee prescribes or sanctions. Illustrations (a) B owes A 2,000 rupees. A desires B to pay the amount to A's account with C, a banker. B, who also banks with C, orders the amount to be transferred from his account to A's credit, and this is done by C. Afterwards, and before A knows of the transfer, C fails. There has been a good payment by B. (b) A and B are mutually indebted. A and B settle an account by setting off one item against another, and B pays A the balance found to be due from him upon such settlement. This amounts to a payment by A and B, respectively, of the sums which they owed to each other. (c) A owes B 2,000 rupees. B accepts some of A's goods in reduction of the debt. The delivery of goods operates as a part payment. (d) A desires B, who owes him Rs. 100, to send him a note for Rs. 100 by post. The debt is discharged as soon as B puts into the post a letter containing the note duly addressed to A. Performance of reciprocal promises 51.Promisor not bound to perform, unless reciprocal promisee ready and willing to perform .—When a contract consists of reciprocal promises to be simultaneously performed, no promisor need perform his promise unless the promisee is ready and willing to perform his reciprocal promise. Illustrations (a) A and B contract that A shall deliver goods to B to be paid for by B on delivery. A need not deliver the goods, unless B is ready and willing to pay for the goods on delivery. B need not pay for the goods, unless A is ready and willing to deliver them on payment. (b) A and B contract that A shall deliver goods to B at a price to be paid by instalments, the first instalment to be paid on delivery. A need not deliver, unless B is ready and willing to pay the first instalment on delivery. B need not pay the first instalment, unless A is ready and willing to deliver the goods on payment of the first instalment. 52.Order of performance of reciprocal promises .—Where the order in which reciprocal promises are to be performed is expressly fixed by the contract, they shall be performed in that order; and where the order is not expressly fixed by the contract, they shall be performed in that order which the nature of the transaction requires. Illustrations (a) A and B contract that A shall build a house for B at a fixed price. A's promise to build the house must be performed before B's promise to pay for it. (b) A and B contract that A shall make over his stock-in-trade to B at a fixed price, and B promises to give security for the payment of the money. A's promise need not be performed until the security is given, for the nature of the transaction requires that A should have security before he delivers up his stock.