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%

这题好晕啊，NN帮解释一下最后一句好吗？我用3/20-9/108 算出来 6点几%

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?

版税的百分比从第一个到第二个下降了多少.

用(3/20-9/108)/(3/20) 就是,计算比较复杂,通过这个计算会简单些,先求两个版税之间的比例.

R1:R2=(3/20)/(9/108)=18:10 再求答案R1-R2)/R1=(18-10)/18=4/9=44.444%

谢谢，你的解答真详细！