单项选择题

A buzzer sounds every 15 minutes．If the buzzer sounded at 12:40，which of the following could be a time at which the buzzer sounded（）

A. 4:05
B. 5:30
C. 6:45
D. 7:15
E. 8:10

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单项选择题
What was the original price of an item if a discount of 20 percent reduced the price to$100（）

A. $80
B. $120
C. $125
D. $150
E. $250
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