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
maths about profit (help!!!)
2007-09-10 1:28 am
回答 (1)
2007-09-10 1:45 am
✔ 最佳答案
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
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賣到 (0.5)(540) = 270 元
(270 - 150) / 150 * 100% = 80%
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