oob73zj92b的部落格

標題:

數學題(20分)

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• 為什麼18禁會訂在18歲而不是19、20歲呢-
• 我想搵D 12-13既工作...
• 點解我隻狗狗一日24小時都唔見佢會sleep-
• SONATE Op.27 No.2 第一選段10分
• 急!!09~10年毅進有幾多課程與紀律部隊有關-

 

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A hawker bought 360 eggs which originally cost $0.5 each at a discount of 20%. He threw away 40 rotten eggs. Then he sold 250 eggs at a marked price of $0.6 each and the rest at a discount of 20% on the marked price. Find (a) the total cost of the eggs, (b) the total selling price, (c) the profit per cent.

最佳解答:

(a)the total cost of the eggs = No of eggs *unit price * (1﹣discount%) = 360 * $0.5 * (1﹣20%) = $360 * 0.5 * 80% = $360 * 0.5 * 0.8 = $144 (b)Income of selling 250 eggs at $0.6 = 250 * $0.6 = $150 Income of selling the rest at discount of 20% = (360﹣40﹣250) * $0.6 * (1﹣20%) = $70 * 0.6 * 80% = $70 * 0.6 * 0.8 = $33.6 Total income = $150 + $33.6 = $183.6 (c)The profit percent = ($183.6﹣$144)/$144 * 100% = 39.6/144 * 100% = 27.5%

其他解答:

(a) total cost of the eggs = $0.5 x 360 x (1 - 20%) = $144 (b) No, of good eggs = 360 - 40 = 320 No. of eggs sold at 20% discount = 320 -250 = 70 Total selling = $0.6 x 250 + $0.6 x 70 x (1 - 20%) = $183.60 (c) Profit % = (183.6 - 144)/144 = 27.5%|||||a) total cost = 360*0.5*0.8 = $144 b) total selling price = 250*0.6 + (360-40-250)*0.6*0.8 = $183.6 c) profit percent = (183.6-144)/144 = 27.5%