Jean, a merchant, offered to sell to Mark, also a merchant, 4 new tables and 16 new chairs for Mark’s business for $10,000 for delivery on June 1st. Mark suggested to Jean that she fax him her offer, outlining the terms of the agreement. On May 1st, Jean faxed Mark the offer, which included all the terms of the agreement. Mark signed the agreement and added the following words: “Offer to sell 4 tables and 16 chairs is agreed to and in addition, Jean will provide 2 additional chairs for a price of $500.” Mark returned his acceptance with the additional terms to Jean. Jean did not respond. Jean delivered 4 tables and 16 chairs on June 1. Did Jean breach her contract with Mark? Explain.