Jim has been working at Gold Key Realty at a salary of $2,000 per month during the past year. For the reason that Jim is considered to be a top salesman the manager of Gold Key is offering him one of three salary plans for the next year (1) a 25% raise to $2,500 per month (2) a base salary of $1,000 plus $600 per house sold or (3) a straight commission of $1,000 per house sold. Over the past year Jim has sold up to six homes in a month.