请教GWD19-27

yvonnege

Q27:

A pharmaceutical company received $3 million in royalties on the first $20 million in sales of the generic equivalent of one of its products and then $9 million in royalties on the next $108 million in sales.  By approximately what percent did the ratio of royalties to sales decrease from the first $20 million in sales to the next $108 million in sales?

A.     8%

B.     15%

C.     45%

D.     52%

E.      56%

谢谢！

Youknowme

以下是引用yvonnege在2006-3-20 14:52:00的发言：

Q27:

A pharmaceutical company received $3 million in royalties on the first $20 million in sales of the generic equivalent of one of its products and then $9 million in royalties on the next $108 million in sales.  By approximately what percent did the ratio of royalties to sales decrease from the first $20 million in sales to the next $108 million in sales?

A.     8%

B.     15%

C.     45%

D.     52%

E.      56%

谢谢！

C

yvonnege

请教思路！版主数学真是好！

Youknowme

设下将的比率为X%，则有如下方程

3/20 （1-X%） =9/108

解得X约等于45%

yvonnege

谢谢！