$25 \%$ of 2004 is equal to
(A) $50 \%$ of 4008
(B) $50 \%$ of 1002
(C) $100 \%$ of 1002
(D) $10 \%$ of 8016
(E) $20 \%$ of 3006
$25 \%$ of 2004 is $\frac{1}{4}$ of 2004 , or 501 .

$50 \%$ of 4008 is $\frac{1}{2}$ of 4008 , or 2004.

$50 \%$ of 1002 is $\frac{1}{2}$ of 1002 , or 501 .

$100 \%$ of 1002 is 1002 .

$10 \%$ of 8016 is $\frac{1}{10}$ of 8016 , or 801.6 .

$20 \%$ of 3006 is $\frac{1}{5}$ of 3006 , or 601.2 .

Answer: (B)