单项选择题

A consumer insulates a house with material bought at 20 percent off the list price of$370．If the consumer also receives are bate of $25 from the manufacturer of the material，how much does the material cost the consumer（）

A. $238
B. $240
C. $263
D. $271
E. $325

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单项选择题

Working alone，a small pump takes twice as long as a large pump takes to fill an empty tank．Working together at their respective constant rates，the pumps can fill the tank in 6 hours．How many hours would it take the small pump to fill the tank working alone（）

A. 8
B. 9
C. 12
D. 15
E. 18

单项选择题

A research scientist wants to study a certain attribute of dogs． It is estimated that approximately 5 percent ofall dogs have this attribute．If the scientist wants to study a sample of N dogs having the attribute，approximately how many dogs should be screened in order to abtain the desired sample size（）

A.
B. 5N
C. 20N
D. 105N
E. 120N

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