答案：E
A photography dealer ordered 60 Model X cameras to be sold for $250 each, which represents a 20 percent markup over the dealer's initial cost for each camera. Of the cameras ordered, 6 were never sold and were returned to the manufacturer for a refund of 50 percent of the dealer's initial cost. What was the dealer's approximate profit or loss as a percent of the dealer's initial cost for the 60 cameras?
(A) 7% loss
(B) 13% loss
(C) 7% profit
(D) 13% profit
(E) 15% profit
答案：D
Ofthe final grades received by the students in a certain math course, 1/5 are A's, 1/4 are B's, 1/2 are C's,and the remaining 10 grades are D's. What is the number of students in the course?
(A) 80
(B) 110
(C) 160
(D) 200
(E) 400
答案：D
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