If c is 25% of a and 10% of b, what percent of a is b? Choose the correct option
A) 2.5%
B) 15%
C) 25%
D) 35%
E) 250%
c is 25% of a --&gt; c=a/4;   c is 10% of b --&gt; c=b/10;   Thus a/4=b/10 --&gt; b=5/2*a=2.5a. Therefore, b is 250% of a.   Answer: 250%
<result>E</result>
If c is 25% of a and 10% of b, what percent of a is b?