$10 \%$ of 10 multiplied by $20 \%$ of 20 equals
(A) 40000
(B) 0.4
(C) 400
(D) 40
(E) 4
$10 \%$ of 10 is $0.1 \times 10=1$ or $\frac{1}{10} \times 10=1$.

$20 \%$ of 20 is $0.2 \times 20=4$ or $\frac{1}{5} \times 20=4$.

Therefore, $10 \%$ of 10 times $20 \%$ of 20 equals $1 \times 4=4$.

ANSWER: (E)