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

A family’s unmet need (which must be covered by a financial aid package. is defined to be the total cost of attending an institution of higher education minus the expected family contribution. What is the unmet need of a family whose income is $55,000 and who has a child attending a 4-year public university（）

A. $700
B. $3300
C. $6800
D. $7500
E. $12,500

单项选择题

An investor wants to sell some of the stock that he owns in Micro Tron and Dynaco Corporations. He can sell Micro Tron stock for $ 36 per share, and he can sell Dynaco stock for $ 52 per share. If he sells 300 shares altogether at an average price per share of $40, how many shares of Dynaco stock has he sold（）

A. 52
B. 75
C. 92
D. 136
E. 184

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