Singer and Company entered into a contract in writing that Singer promised to perform for the new year's party and Company promised to pay Singer $1,000. Three days before the party, Singer asked Company to pay an additional $200 or he will not perform. Company had no choice but agreed to pay Singer the additional $200 (total payment will be $1,200). When the new year's party was over, Company paid Singer only $1,000 as they originally agreed. In a suit by Singer to claim the additional $200 against Company, will Singer be successful? Suppose when Singer asked Company to pay the additional $200, Company refused his request. However, Rich, who is a big fan of Singer, promised Singer to pay the additional $200. When the new year's party was over, Company paid Singer only $1,000. Is Singer entitled to request Rich to pay $200? Why or why not?