og12 PS 109不懂啊，哪位帮忙翻译一下

cireb

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 the royaties 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%
题目没有看懂，哪位能帮忙解释一下？非常感谢？

南在南方

这道题就是问你后来的那个ratio比前面那个ratio下降了多少百分比，分母是前面那个ratio.也就是问你之前的版税率是3/20，后来的版税率是9/108，后面的那个版税率比前面那个版税率下降了多少百分比

南在南方

（3/20-9/108）/（3/20）

cireb

哦！明白了！谢谢！