问题详情

Maurice earns $12.50 per hour for the first 40 hours he works each week. For each hour beyond 40 that he works in 1 week, Maurice earns $18.75 per hour. Last week Maurice earned $931.25. How many hours did Maurice work last week？
A.23
B.30
C.55
D.63
E.76请帮忙给出正确答案和分析，谢谢！