问一道很简单的英文应用题

问题描述:

问一道很简单的英文应用题
An insurance salesperson,who sold 260 policies last year,has averaged 4 policies per week for the first 8 months of this year.How many policies per week must he average in the remaining weeks in order to equal his performance for last year?
由于告诉的是前8个月,而问又是星期为单位,每个月几个星期又不固定,怎么换算能够达到最高效率?

52/12=4.333333333
4.333333*8=34.66666667
34.666666667*4=138.66666667
260-139=121
121/4=30.25
30.25/4=7.6=8
一年有五十二个礼拜,平均每个月就有4.3个.