[計量] 求一個比率
A merchant sells an item at a 20 percent discount,
but still makes a gross profit of 20 percent of the cost,
what percent of the cost would the gross profit on the item
have been if it had been sold without the discount?
我算是40% 但答案是50% 不知道為何請板上大家幫忙解題 感恩
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