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profit or gross profit = revenue - cost
However, when the stimulus says that the profit is 80% of the cost, it means the mathematical relationship, not the definition of the term.
A产品卖了3 times as much as B, A 的profit是A 成本的80%，B 的profit 是B成本的20%，问profit占total 成本的多少
categories A B
number 3*n n
cost a b
total cost a*3*n b*n
profit 0.8a 0.2b
total profit 2.4*na 0.2*nb
ratio of total profit over total cost = [2.4*na + 0.2*nb] / [3*na + nb]=[12a +b] / [15a + 5b] |
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发表于 2010-12-7 11:21:34
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