For the first 40 hours of work each week, Mr. Ericson earns $600. For each hour over $40 hours, Mr. Ericson earns $22.50 an hour. The company can pay each employee up to $960 per week. Without going over the weekly budget, Mr. Ericson can work up to

B. 40 hours
C. 56 hours
D. 60 hours