Harry charges $\$ 4$ to babysit for the first hour. For each additional hour, he charges $50 \%$ more than he did for the previous hour. How much money in total would Harry earn for 4 hours of babysitting?
(A) $\$ 16.00$
(B) $\$ 19.00$
(C) $\$ 32.50$
(D) $\$ 13.50$
(E) $\$ 28.00$
Since Harry charges $50 \%$ more for each additional hour as he did for the previous hour, then he charges 1.5 or $\frac{3}{2}$ times as much as he did for the previous hour.

Harry charges $\$ 4$ for the first hour.

Harry then charges $\frac{3}{2} \times \$ 4=\$ 6$ for the second hour.

Harry then charges $\frac{3}{2} \times \$ 6=\$ 9$ for the third hour.

Harry then charges $\frac{3}{2} \times \$ 9=\$ \frac{27}{2}=\$ 13.50$ for the fourth hour.

Therefore, for 4 hours of babysitting, Harry would earn $\$ 4+\$ 6+\$ 9+\$ 13.50=\$ 32.50$.

ANSWER: (C)