Read the following situation and answer the questions. Tim, a merchant, wrote to Marcus: "March 1, I offer to sell you one Model A Laptop Computer, price $600. This is a firm offer for 30 days from the above date. (Signed) Tim".

(a) On March 10, Marcus received a letter from Tim: "I hereby revoke my offer of March 1." On March 17, Marcus sent Tim a letter stating: "I hereby accept your offer of March 1." Is there a contract? Fully explain.

(b) Assume that Tim's offer stated that it was a firm offer for four months and that on June 15, Marcus received a letter from Tim stating: "I hereby revoke my offer of March 1."On June 16 Marcus mailed his acceptance letter.Is there a contract? please Fully explain.