JJ:264
shop X sells brand A 3 times than brand B, they make 80% profit on brand A and
20% profit on brand B, what's the total profit percentage compared to the total
purchase price ?
想請問一下解題的思路
賣出的量是 3:1
獲利比是 4:1
怎麼獲利和成本比呢??
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