3/20 is what percent of 12/25?

A. 42.75%
B. 31.25%
C. 35.5%
D. 40.5%
E. None of these

Explanation:

Let the required percentage be x%.

3/20 = x% of 12/25 => 3/20 = x/100 * 12/25
=> 12x = (300 * 25)/20 => x = (25 * 25)/20
=> x = 31.25%.