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试卷名称:GMAT（QUANTITATIVE）数学模拟试卷5

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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. If Greg is to receive an average (arithmetic mean) commission of exactly $220 on the four sales, then the fourth commission must be:

A．$135

B．$155

C．$220

D．$235

E．$645

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