At the Gauss Store, you earn 5 "reward points" for each $\$ 25$ you spend. When Stuart spends $\$ 200$ at the Gauss Store, the number of reward points that he earns is
(A) 5
(B) 8
(C) 40
(D) 125
(E) 1000
Since Stuart earns 5 reward points for every $\$ 25$ he spends, then when he spends $\$ 200$, he earns $\frac{200}{25} \times 5=8 \times 5=40$ points.

Answer: (C)