Mr. S and Mr. R made contract wherein Mr. S agreed to deliver paper cup manufacture machine to Mr. R and to receive payment on delivery. On the delivery date, Mr. R did not pay the agreed price. Decide whether Mr. S is bound to fulfil his promise at the time of delivery?

As per Section 51 o Legal representatives of X f the Indian Contract Act, 1872, when a contract consists of reciprocal promises to be simultaneously performed, no promisor needs to perform his promise unless the promisee is ready and willing to perform his reciprocal promise. Such promises constitute concurrent conditions and the performance of one of the promise is conditional on the performance of the other. If one of the promises is not performed, the other too need not be performed. Referring to the above provisions, in the given case, Mr. S is not bound to deliver goods to Mr. R since payment was not made by him at the time of delivery of goods.