On 3 sales John has received commissions of $240,80,and$110 and he has 1 additional sale pending. if John is to receive an average commission of exactly$150 on the 4 sales, then the 4th commission must be A 164 B 170 C 175 D 182 E 185 請問黃色部分是什麼意思呢? 如果翻成銷售期間 和上下文就不對了, sale pending 是指第四個commission嗎?