三道英文的数学题 请详细说明一下提干的意思 一定通俗易懂

三道英文的数学题 请详细说明一下提干的意思 一定通俗易懂
请详细说明一下提干的意思 一定通俗易懂
1.Computering Hourly Wages
Mark is paid time-half for hours worked in excess of 40 hours and double-time(啥意思?) for hours worked on Sunday.If Mark had gross weekly wages of $342 for working 50 hours,4 of which （which代表什么?）were on Sunday,what is her regular rate?
2.Computering Grades
Going inti the final exam,which will count as 2 tests(这里到底啥意思?).Bob has test scores of 80,83,71,61,and 95.What scores does Bob need on the final in order to have an average score of 80?(答案是80 )
3.Personal Finace :Cost of a car
The suggested list priceof a new car is $18,000.The dealer's cost is 85% of list.How much will you pay if the dealer is willing to accept $100 over cost for the car?
2题答案打错了 是 85 不好意思！