Q18:
Last year the price per share of Stock X increased by k percent and the earnings per share
of Stock X increased by m percent, where k is greater than m. By what percent did the
ratio of price per share to earnings per share increase, in terms of k and m?
A. k/m %
B. (k-m) %
C. [100(k-m)]/(100+k) %
D. [100(k-m)]/(100+m) %
E. [100(k-m)]/(100+k+m) %
Answer:

答案为什么是D?
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Q19:
Month Number of Days Worked
June 20
July 17
August 19
The table above shows the number of days worked by a certain sales representative in
each of three months last year. If the number of sales calls that the representative made
each month was proportional to the number of days worked in that month and if the
representative made a total of 168 sales calls in the three months shown, how many sales
calls did the representative make in August?
A. 50
B. 51
C. 56
D. 57
E. 60

Why D??? ...NN help!