A doctor prescribed 18 cubic centimeters of a certain drug to a patient whose body weight was 120 pounds.If the typical dosage is 2 cubic centimeters per 15 pounds of body weight,by what percent was the prescribed dosage greater than they typical dosage? A 8 B 9 C 11 D 12.5 E 14.8 这道题我用120/8-15/2=7.5,再用7.5/15=50% 所以找不到答案，不知道这道题正确方法是什么呢

Jennifer:Video rental outlets in Centerville together handled 10,000 fewer video rentals in 1994 than in 1993. The decline in rentals was probably due almost entirely to the February 1994 opening of Videorama, the first and only video rental outlet in the area that, in addition to renting videos, also sold them cheaply. Brad:There must be another explanation: as you yourself said, the decline was on the order of 10,000 reatals. Yet Videorama sold only 4,000 videos in 19994. Which of the following ,if true, would most seriously weaken the force of the objection that Brad presents to Jennifer's explanation? A. in 1993 Videorama rented out more videos than it sold. B. in 1994 two new outlets that rent but that do not sell videos opended in Centerville. C. Most of the video rental outlets in Centerville rent videos at a discount on certain nights of the week. D. People often buy videos of movies that they have previously seen in a theater. E. People who own videos frequently loan them to their friends. 正确选项：E 错误选项：A 疑惑点：觉得这道题所给的每个选项都无法表示驳斥。尤其是E，里面说的是借的问题但未必影响VIDEO的购买量，如何做到驳斥呢？请详细解答每个选项的驳斥与否的原因。

A doctor prescribed 18 cubic centimeters of a certain drug to a patient whose body weight was 120 pounds.If the typical dosage is 2 cubic centimeters per 15 pounds of body weight,by what percent was the prescribed dosage greater than they typical dosage? A 8 B 9 C 11 D 12.5 E 14.8 这道题我用120/8-15/2=7.5,再用7.5/15=50% 所以找不到答案，不知道这道题正确方法是什么呢