david bought 100 rubbers for $200 .he sold 30% of them at a price of $4 each and then sold the remaining rubber at $3 each .find the percentage change.
人气：329 ℃ 时间：2020-01-28 14:10:57
解答
the total money he get from solding all rubbers=30*4+70*3=$330
so the changed percentage=330/200=165%
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