If P gets 25% more than Q, then by what percent does Q get less than P?

A. 33 1/3%
B. 30%
C. 20%
D. 16 2/3%
E. None of these
Explanation:
Let Q get 1 unit.
25% of 1 unit = 1/4 = 0.25
P gets (1 + 0.25) i.e., 1.25 units.
Difference = (1.25 – 1) = 0.25
Required percentage = 0.25/1.25 * 100 = 1/5 * 100 = 20%