Explanation:
In the given case it is valid contract as there is time, promise, benefit and obligation to do thing. But verbal contracts are difficult to prove. Stan and Byron have a verbal contract which is a promise for 10 days and the contract has exchange of goods for $600. Offer is made by Byron but the acceptance is not yet given by Stan.
Here only the offer is made and it is not yet accepted by Byron. here Stan has revoked the offer through letter so the revoke has been communicated to the other party through letter. So in this case there is no breach of contract as the contract was clearly revoked by Stan through his letter.