Carcass wrote:
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%
First $20 million: royalties/sales ratio = 3/20 =
36/
240Next $108 million: royalties/sales ratio = 9/108 = 1/12 =
20/
240Noticed that I rewrote both with the SAME DENOMINATOR.
So, now all we need to is determine the percent change from
36 to
20.
To do so, we
could use some more lengthy calculations [e.g., 100(36-20)/36]
HOWEVER, notice that, if we start at 36, a 50% decrease would give us 18.
So going from 36 to 20, must be a decrease that's LESS THAN 50% (but also pretty close to 50%)
Only one answer choice works.
Answer: C