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百分數應用題(英文)

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A book is sold for $55 at a profit of 10%, Find the cost of the book 請清楚列式和答案

最佳解答:

一本書的售價是 $55,盈利有 10%,請問成本是多少? 設成本是 x, (x)(1+10%)= 55 (x)(110 / 100)= 55 x = 55 x 100 ÷ 110 x = 50 ∴ 成本是 $50 _____________________________________________________ 不信?哪我們驗証一下吧。 售價是: (50)(1+10%) =(50)(110 / 100) = $55 (1+10%)的 1 是指整體 而 +10% 是因為盈利有十 如果成本是 $50 的話 售價計算出來的就是題目所說的 $55 所以成本是 $50 元這個是沒錯的 2010-02-14 00:27:24 補充: 補充一下: 而 +10% 是因為盈利有 10%(漏了 %)

其他解答:

Let n be the cost of the book. n (1+10%) = $55 110n/100 = $55 11n/10 = $55 11n = $550 n = $50 therefore the cost of the book is $50|||||A book is sold for $55 at a profit of 10%, Find the cost of the book the cost of the book , 55 x (1-10%) = 55 x 90% = 55 x 90 / 100 = $ 49.5 (3 點 ) the cost of the book is $ 49.5|||||一本書售價係$55, 有10%盈利, 成本係幾多?? 55 x (1-10%) = 55 x 90% = $49.5 Hope I can help you!!~ 希望可以幫到你!!~
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