A P 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 royalities on the next $ 108 million in sales. By appromximately what percent did the radio of royalities to sales decrease from the first $20 million in sales decrease from the first $20 million in sales to the next 108 million in sales? A. 45% B 55% c 75% D 60% 题目是没错的。 但是真的不太懂这题什么意思,NN 帮忙接下吧。