单项选择题

The advertised rate for roaming charges is 0. 002 cents per second. What is that in dollars per hour

A. 7.2
B. 2
C. 0.72
D. 0.2
E. 0.072
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单项选择题
At the time during year X when the aggregate price of ABC and XYZ stock was the greatest, the price of ABC stock was approximately what percent of the price of XYZ stock （）

A.25
B.60
C.70
D.140
E.170
单项选择题
When 9 students took a zoology quiz with a possible score of 0 to 10 inclusive, their average (arithmetic mean) score was 7.5. If a tenth student takes the same quiz, what will be the least possible average score on the quiz for all 10 students （）

A.6.5
B.6.75
C.7.0
D.7.25
E.7.5
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