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英文数学应用题!A company produces a toy for which the variable cost

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英文数学应用题!
A company produces a toy for which the variable cost is $12.30 per unit and the fixed costs are $98,000.The toy sells for $17.98.Let X be the number of units produced and sold.
a) The total cost for a business is the sum of the variable cost and the fixed costs.Write the total cost C as a function of the number of units produced.
b)Write the revenue R as a function of the number of units sold.
c)Write the profit P as a function of the number of units sold.NOTE:(P=R-C)
英文数学应用题!A company produces a toy for which the variable cost
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一个公司生产一种玩具.这种玩具,每个消耗可变成本12.30美元,固定成本98000美元.这种玩具每个卖17.98美元.设X为玩具生产和卖出的数量.
a)这个公司总的生产成本是总的可变成本加固定成本.已知总的生产成本为C,计算玩具的生产数量.
b)已知收入为R,计算玩具的销售量.
c)已知利润为P,计算玩具的销售量.注意:(利润=收入-总成本)
a)X=(C-98000)/12.30
b)X=R/17.98
c)(17.98-12.30)*X-98000=P ; X=P+98000/(17.98-12.30)