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發問:

Complete the followiing table. original percentage changechange in valuenew valuea)503%b)24-20%c)9%45d)5511e)25225f)-151851)Steven bought 400 apples at at total od$1000. Later he found that 10 of the apples have decayed. Then sold the remaining apples at$3 each. Find the profit/loss percentage of Steven if... 顯示更多 Complete the followiing table. original percentage changechange in valuenew valuea)503%b)24-20%c)9%45d)5511e)25225f)-15185 1)Steven bought 400 apples at at total od$1000. Later he found that 10 of the apples have decayed. Then sold the remaining apples at$3 each. Find the profit/loss percentage of Steven if all the remaining apples were sold. 2)Charles's monthly salaryy is $8000. He uses 60% of his salary on food and transportation, 25% on entertainment and he saves the remaining. a)Find the amount he saves each month. b)If his monthly salary is now increased by $500 and he saves them all, find the percentage of salary thathe saves. 3)The cost of a music box is $450. The marked price is 20% higher than the cost. In order to increase the sales, the shopkeepert gives a 20% discount to all customers. What is the selling price os the music box? 4)Two shops are selling the same model of furniture. In shop a, the marked price is$1200 with a discount percentage of 15%. In shop b, the marked price is$1100 with a discount percentage od 10%. Which shop would you prefer to go to buy the furniture? Briefly explain your answer.

最佳解答:

你好，我是STY，我的解答如下： a) change in value = 50 * 3% = 1.5 new value = 50 + 1.5 = 51.5 b) change in value = - 24 * 20% = -4.8 new value = 24 - 4.8 = 19.2 c) original = 45 / 9% = 45 * 100 / 9 = 500 new value = 500 + 45 = 545 d) percentage change = 11/55 * 100% = 20% new value = 55 + 11 = 66 e) original = 225 - 25 = 200 percentage change = 25/200 * 100% = 12.5% f) original = 185 - (-15) = 200 % change = - 15/200 * 100% = -7.5% 1) amount of $ Steven have = $3 * (400 - 10) = $3 * 390 = $1170 profit % = $(1170 - 1000) / $1000 * 100% = 170 / 1000 * 100% = 17% 2a) the amount Charles save = $8000 * (1 - 60% - 25%) = $8000 * 15% = $1200 b) the amount he can save now = $1200 + $500 = $1700 total amount of salary = $8500 percentage = $1700 / $8500 * 100% = 20% 3) The selling price of the music box = $450 * (1 + 20%) * (1 - 20%) = $450 * 1.2 * 0.8 = $450 * 0.96 = $432 4) Selling price of shop A = $1200 * (1 - 15%) = $1020 Selling price of shop B = $1100 * (1 - 10%) = $990 I would prefer to buy in shop B By STY~

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