2. 外语
  3. 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

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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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