200. A store currently charges the same price for each towel that it sells. If the current price of each towel was to be increased by $1, 10 fewer of the towels could be bought for $120, excluding sales tax. What is the current price of each towel?
(A)$ 1 (B)$ 2 (C)$3 (D)$ 4 (E)$ 12
答案：c
248。Right triangle PQR is to be constructed in xy-plane so that the right angle is at P and PR is parallel to the x-axis. The x- and y-coordinates of P< Q, and R are to be integers that satisfy the inequalities-4<=x<=5 and 6<=y<=16. How many different triangles with these properties could be constructed?
A 110
B 1100
C 9900
D 10000
E 12100
答案：c
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