[求助]新东方补充材料蓝皮书上225

向大家请教一下下面这道题

Holiday receipt---the total sales recorded in the fourth quarter of the year---determine the economic success or failure of many retail businesses. Camco, a retailer selling just one camera model, is an excellent example. Camco's holiday receits, on average, account for a third of its yearly total receipts and about half of its yearly profits.

If the statements above are true, which of the following must also be true about Camco on the basis of them?

(A) Its fixed expenses per camera sold are higher during the fourth quarter than for any of the other three quarters.

(B) It makes more profit during the first and third quarters combined than during the fourth quarter.

(C) Its per-camera retail price is lower, on average, during the fourth quarter than during any one of the first three quarters.

(D)It makes less profit, on average, for a given dollar amount of sales during the first three quarters combined than during the fourth quarter.

(E) The per-camera price it pays to wholesalers is higher, on average, during the fourth quarter than during any of the other three quarters.

Answer: D

原句意思：节假日期间的销售（第四季度）对一个零售企业的全年经营效益很重要。Camco公司，一个只卖Camera的零售商，就是一个很好的例子。节假日期间的销售占到Camco公司的1/3，而利润占到1/2。

A.节假日期间的固定支出高于其他季度；

B.前三季度的利润高于第四季度；

C.第四季度的平均零售价高于其他季度；

D.前三季度的平均利润低于第四季度；

E.第四季度给批发商的价格高于其他三个季度。

如果明白了原文意思“节假日期间的销售占到Camco公司的1/3，而利润占到1/2”。以1/3的销售实现了1/2的利润，其实就是D。

而A中的固定支出，C中的平均售价，E中的批发商价格都是无关，而B正好和D相反。

嗯！明白了，太感谢了

从　数学的角度
第四季度的销售报酬率为１／２　比上　１／３

而前三个月平均为　１／２　比上２／３