Jack bought an engagement ring from Jewelry Store for $20,000. He paid $5,000 cash down and signed a promissory note for the $15,000 balance. Later he saw that other merchants were selling identical rings for only $9,000. Jack demanded cancellation of the contract on the grounds that the store did not give sufficient consideration.

		Jack wins because of the large difference between the contract price and the market price.
		Jack cannot cancel the contract, but he will have to pay only $9,000.
		The store is entitled to $20,000 under quasi contract.
		The Jewelry Store wins because it gave sufficient consideration to make the contract enforceable.
		I do not know