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標題:

Math`

發問:

1. Kent spent 55% of his pocket money on buying a computer games, 25% on buying a musical disa and saved the rest.If she saved $20,find the total pocket money he had.2. If John selld the tickets for concert at a price of $350, he will lose$50.If he wants to get a profit of 15%,what should be the selling... 顯示更多 1. Kent spent 55% of his pocket money on buying a computer games, 25% on buying a musical disa and saved the rest.If she saved $20,find the total pocket money he had. 2. If John selld the tickets for concert at a price of $350, he will lose$50.If he wants to get a profit of 15%,what should be the selling price? 3.A case of CD-RS has 100 boxes.Each box has 100 pieces of CD-RS.The cost price of each box is $128.If the merchant wants to get a profit of $0.22 for each CD-RS. (a) find(i) the selling price of each box. (ii) the profits% of each case. (b) the merchant wants to change his selling strategy.He decides to sell a pack of 50 pieces of CD-RS at a price of$74.Find the profit % of each case.

最佳解答:

1. Let $S be the total pocket money that John had. S - (55% + 25%)S = 20 S - 0.8S = 20 0.2S = 20 S = 100 Ans: John had $100 of pocket money. ===== 2. Cost of the tickets = $350 + $50 Cost of the tickets = $400 Selling price of the tickets = $400 x (100 + 15)% Selling price of the tickets = $460 ===== 3.(a)(i) Profit for each box = $0.22 x 100 Profit for each box = $22 The selling price of each box = $128 + $22 The selling price of each box = $150 ===== (a)(ii) Cost of each case = $128 x 100 = $12800 Profit of each case = $0.22 x 100 x 100 = $2200 Profit % of each case = ($2200/$12800) x 100% Profit % of each case = 17.1875% ===== 3.(b) Selling price of each box = $74 x (100/50) Selling price of each box = $148 Selling price of each case = $148 x 100 Selling price of each case = $14800 Profit of each case = $14800 - $12800 Profit of each case = $2000 Profit % of each case = ($2000/$12800) x 100% Profit % of each case = 15.625% =

其他解答:

1. let X be the total pocket money X*(1-55%-25%)=$20 X*20%=$20 X=$100 2. sell$ 350 will lost $50,so the original price is $400. $400*(1+15%) =$460 3. 1st find out the selling price for each CDR, $128/100+0.22=$1.5 then each box has 100 pcs CDR,so the selling price of each box is a) (i) $1.5*100=$150 (ii) ($150*100-$128*100)/$128*100*100%=17.1875% b)($74*2-$128)/$128*100%=15.625%6A560DB68EC65D60