问题标题：
davidbought100rubbersfor$200.hesold30%ofthematapriceof$4eachandthensoldtheremainingrubberat$3each.findthepercentagechange.
问题描述：
davidbought100rubbersfor$200.hesold30%ofthematapriceof$4eachandthensoldtheremainingrubberat$3each.findthepercentagechange.
雷鹏回答：
thetotalmoneyhegetfromsoldingallrubbers=30*4+70*3=$330
sothechangedpercentage=330/200=165%
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