Jane and joseph sechrist signed a contract to have a swimming pool built in their backyard for $10,000. the salesman for the pool company signed the contract as well on a space marked "salesperson." two days after the contract was signed, the salesman called the sechrists back and asked them to come in and sign a new contract for $11,000 because the vice president had not approved the original price. jane has checked the contract and discovered that there is no language that requires the approval of anyone other than the salesperson. jane and joseph can have their pool built for $10,000 because: