If $x \%$ of 60 is 12 , then $15 \%$ of $x$ is
(A) $\frac{3}{4}$
(B) $\frac{1}{3}$
(C) 4
(D) 3
(E) 9
Solution 1

Since $x \%$ of 60 is 12 , then $\frac{x}{100} \cdot 60=12$ or $x=\frac{12 \cdot 100}{60}=20$.

Therefore, $15 \%$ of $x$ is $15 \%$ of 20 , or $0.15 \cdot 20=3$.

## Solution 2

Since $x \%$ of 60 is 12 , then $\frac{x}{100} \cdot 60=12$ or $\frac{60 x}{100}=12$.

In terms of $x, 15 \%$ of $x$ equals $\frac{15}{100} x$ or $\frac{15 x}{100}$.

Since $\frac{60 x}{100}=12$, then $\frac{15 x}{100}=\frac{1}{4}\left(\frac{60 x}{100}\right)=\frac{1}{4} \cdot 12=3$.

ANSWER: (D)