Last week, a charity fundraiser had 8 volunteers who each worked 40 hours and who each raised $\$ 18$ per hour. This week, 12 volunteers, each working 32 hours, raised the same total amount of money. How much did each volunteer raise per hour this week?
(A) $\$ 9$
(B) $\$ 12$
(C) $\$ 15$
(D) $\$ 21$
(E) $\$ 24$
8 volunteers who each work 40 hours and each raise $\$ 18$ per hour will raise $8 \times 40 \times 18=\$ 5760$.

If 12 volunteers each work 32 hours and raise a total of $\$ 5760$, then they each raise $\frac{5760}{12 \times 32}$ or $\$ 15$ per hour.

ANSWER: (C)

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