If c is 25% of a and 10% of b, what percent of a is b? Choose the correct choice from the following:
A) 2.5 %	B) 15 %	C) 25 %	D) 35 %	E) 250 %

Rationale: "c is 25 % of a - - > c = a / 4 ; c is 10 % of b - - > c = b / 10 ; thus a / 4 = b / 10 - - > b = 5 / 2 * a = 2.5 a . therefore , b is 250 % of a . answer : e"
Answer: E