If $50 \%$ of $N$ is 16 , then $75 \%$ of $N$ is
(A) 12
(B) 6
(C) 20
(D) 24
(E) 40
The percentage $50 \%$ is equivalent to the fraction $\frac{1}{2}$, while $75 \%$ is equivalent to $\frac{3}{4}$.

Since $50 \%$ of $N$ is 16 , then $\frac{1}{2} N=16$ or $N=32$.

Therefore, $75 \%$ of $N$ is $\frac{3}{4} N$ or $\frac{3}{4}(32)$, which equals 24 .

ANSWER: (D)