1) If the discount is $120 and the discount% is 4%, find the marked price and selling price.
2) Find the new value of each of following:
a. 60 has increased by 15%
b. 30 km has increased by 40%
c. 120 has decreased by 25%
d. 90 m has been decreased by 20%
3) After raising the price by 7%, a table was sold at $802.5. What was the original price?
可以的話……唔該講下每條既中文意思……
數學percentage問題 F.1
2009-07-21 5:40 am
回答 (1)
2009-07-21 6:24 am
✔ 最佳答案
1) let the original marked price be $y4%y=120
y=3000
so, the original marked price is $3000
3000-120
=2880
so, the selling price is $2880
2a) 69
b) 42
c) 90
d) 72
3) let the original price be $y
(1+7%)y=802.5
y=802.5/1.07
y=750
so, the origianl price is $750
收錄日期: 2021-04-13 16:44:16
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