GMAT考试

【单选题】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:
A、$135
B、$155
C、$220
D、$235
E、$645

网考网参考答案：D
网考网解析：
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. document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>