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Greg sells gaskets. On three sales, Greg has received commissions of $385, $70, and $190, and he has one additional sale pending
Greg sells gaskets. On three sales, Greg has received commissions of $385, $70, and $190, and he has one additional sale pending
admin
2019-02-01
57
问题
Greg sells gaskets. On three sales, Greg has received commissions of $385, $70, and $190, and he has one additional sale pending. If Greg is to receive an average (arithmetic mean) commission of exactly $220 on the four sales, then the fourth commission must be:
选项
A、$135
B、$155
C、$220
D、$235
E、$645
答案
D
解析
For the average of four commissions to be $220, the total must be 220×4=880. 880 minus the sum of the three listed commissions (385+70+190=645) equals $235.
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