中一数学题.只有英文.Jackyused$40000tobuy5000dollsfromatoymanufacturer.HedoubledthepriceforeachdollandsoldthemintheLunarNewYearMarket.Afterthemarketwasclosed,750dollswereleftunsold.问：WhatwasJacky'spro

Question

中一数学题.只有英文.
Jacky used $40000 to buy 5000 dolls from a toy manufacturer.He doubled the price for each doll and sold them in the Lunar New Year Market.After the market was closed ,750 dolls were left unsold .
问：What was Jacky's profit per cent if all the unsold dolls were donated to charities?

Answer 1

Jacky used $40000 to buy 5000 dolls from a toy manufacturer.He doubled the price for each doll and sold them in the Lunar New Year Market.After the market was closed,750 dolls were left unsold .
问：What was Jacky's profit per cent if all the unsold dolls were donated to charities?
翻译：
Jacky从玩具商那花了40000美元买了5000只娃娃.他把每只娃娃的销售价格翻一倍并在阴历新年市场卖掉他们.市场关门后,还有750只娃娃没有卖掉.
问：如果Jacky将没有卖掉的娃娃全部捐给慈善机构,那么他的利润百分比是多少?（即利润率）
Jacky每只娃娃的进价为：40000÷5000=8美元,售价为：8×2=16美元
销售金额为：16×（5000-750）=68000美元
销售利润为：68000-40000=28000美元
利润百分比（即利润率）的公式为：利润率=利润÷成本×100%
因此,利润百分比为：
28000÷40000×100%=70%
即Jacky的利润百分比为70%