求懂数学题和英文的人解答.Baseball agent A earns commission of 2,150 .3,000 and 2,980 on three players' salaries,respectively and he will soon acquire another client.If agent A is to receive an average commission of exactly 2,600. then the

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求懂数学题和英文的人解答.Baseball agent A earns commission of 2,150 .3,000 and 2,980 on three players' salaries,respectively and he will soon acquire another client.If agent A is to receive an average commission of exactly 2,600. then the
求懂数学题和英文的人解答.
Baseball agent A earns commission of 2,150 .3,000 and 2,980 on three players' salaries,respectively and he will soon acquire another client.If agent A is to receive an average commission of exactly 2,600. then the 4th commission must be ?
please give your formula .
本人数学超差,情大家帮忙!
The formula please!!!

求懂数学题和英文的人解答.Baseball agent A earns commission of 2,150 .3,000 and 2,980 on three players' salaries,respectively and he will soon acquire another client.If agent A is to receive an average commission of exactly 2,600. then the
如果代理人想收到至少平均每次2600元的佣金,那么第四个人的佣金应为多少?2270
我X,你还找我要公式.
2150+3000+2980+X=4*2600
X=2270,OK?