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標題:
maths about profit (help!!!)
發問:
A buys 600汪,10% of which are rotten. BY selling the good ones at$ 5 a dozen, he makes a profit of 50% on the whole i) find the original cost of one dozen eggs ii)find the profit percenttage if he sells the good ones at$0.5each
最佳解答:
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係咪 買 600 隻, 10% 壞左? 當你係 let x be original cost of one dozen eggs 好既有 (600)(90%) = 540 隻 賣到 (540)(5)/12 = 225 元 (225 - 總成本 ) / 總成本 = 50% 總成本 = 150 元 (買到 600 隻) x = (150)(12)/ 600 = 3 -------------------------------------------------- 賣到 (0.5)(540) = 270 元 (270 - 150) / 150 * 100% = 80%
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