sat数学题（英语） Tom and Alison are both salespeople,Tom's weekly

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sat数学题（英语）
Tom and Alison are both salespeople,Tom's weekly compensation consists of $300 plus 20 percent of his sales.Alson's weekly compensation consists of $200 plus 25 percent of her sales.if they both bad the same amount of slaes and the same compensaton for a particular week what was that compensation in dollars.(Disregard the dollar sign when gridding your answer)

Let the sales be a dollars and compensation be b dollars
Tom:300 + a*20% = b
Alison:200 + a*25% = b
300 + 0.2a = 200 + 0.25a,0.05a = 100,a = 2000
b = 300+2000*20% = 300 + 400 = 700

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