10.Jacky plans to buy a pair of shoes. Two weeks ago,he saved 40% of the selling price of the shoes. Last week,he saved 80% of the rest.This week,the shoes are on sale at a 10% discount ,but he still owes $12. Find the original selling price of the shoes.
12. A shopkeeper raised the marked price of a dress by 20%.It was originally marked at $500. He then sold it to a customer at a 20% discount.
a)Find the new marked price.
b)Find the selling price.
c)Find the overall discount percent.
maths 解釋&答
2006-11-09 5:04 am
回答 (1)
2006-11-09 5:23 am
✔ 最佳答案
10. Let the original selling price of the shoe is y For last week and two weeks ago, he totally saved = (40% + (1-40%) x 80%) x y
= 0.88y
Price of the shoe this week = (1-10%) x y = 0.9y
Then, 0.9y - 0.88y = 12
0.02y = 12
y=$600
12.
a) The new marked price = $500 x (1+20%) = $600
b) The selling price = $600 x (1-20%) = $480
c) Overall discount percent = 1- ($480 / $500) = 4%
參考: no ref.
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