单项选择题

A certain money market account that had a balance of $48，000 during all of last monthearned$360 in interest for the month．At what simple annual interest rate did the account earn interest last month（）

A. 7%
B. 7.5%
C. 8%
D. 8.5%
E. 9%

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单项选择题
The daily rate for a hotel room that sleeps4 people is$39 for one person and x dollars for each additional person．If 3people take the room for one day and each pays $21 for the room，what is the value of x？（）

A. 6
B. 8
C. 12
D. 13
E. 24
单项选择题
If the cost of a long—distance phone call is c cents for the first minute and cents for each additional minute，what is the cost，in cents．of a 10-minute call of this type？（）

A.A
B.B
C.C
D.D
E.E
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