单项选择题

Of the following，the category that had expenditures most nearly equal to the average(arithmetic mean)expenditures per category was（）

A. refugee housing
B. emergency workers
C. post disaster assistance
D. new investments
E. cornmodities

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单项选择题

If Cashier S’s hourly wage were to increase by 10 percent and S’s weekly hours were to decrease by 10 percent from last week’s total hours，what would be the change，if any，in S’s total weekly wage（）

A. An increase of $1.3
B. An increase of $0.55
C. No change
D. A decrease of $0.55
E. A decrease of $1.37

单项选择题

If School X purchased 300 textbooks in1971 and all of these textbooks either were counted in the inventory or had been discarded before the inventory， what percent of these textbooks had been discarded（）

A. 10%
B. 20%
C. 50%
D. 80%
E. 100%

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