A pharmaceutical company received $2 million in royalties on the first $15 million in sales of generic equivalent of one of its products and then $6 million in royalties on the next $72 million in sales. By approximately what percent did the ratio of royalties to sales decrease from the first $15 million in sales to the next $72 million in sales?  Choose the correct choice from the following.
A) 25%  B) 30%  C) 32.5%  D) 37.5%  E) 40%
change in ratio of royalties to sales = 2/15 -6/72 = 1/20   % decrease = (1/20)/(2/15) *100= 
<gadget id="calculator">(1/20)/(2/15) *100</gadget>
<output>75/2 = around 37.5</output>
37.5%   Answer: 37.5%)
<result>D</result>
A pharmaceutical company received $2 million in royalties on the first $15 million in sales of generic equivalent of one of its products and then $6 million in royalties on the next $72 million in sales. By approximately what percent did the ratio of royalties to sales decrease from the first $15 million in sales to the next $72 million in sales?