1.The selling price of an article is first increased by 25% and then decreased by 25%.What is the final selling price?
2.The marked price of a pen is $12.5 and it is sold at a discount of 20%.If the profit is $2,find the profit %.
Answer and Explain the above equation.
數學的問題!!!!!!!!!!!!!!!!!!!!!!!!!!
2007-11-19 12:52 am
回答 (2)
2007-11-19 1:04 am
✔ 最佳答案
1) Let the original selling price be $x. After the increase and decrease, it becomes:
$ x ( 1 + 25% )( 1 - 25% )
= $0.9365 x
which is 6.25% less than the original selling price
2) The selling price:
$ 12.5 x ( 1 - 20% )
= $10
The cost price = $ 10 - 2 = $ 8
Profit % = ( Profit / Cost ) x 100%
= ( 2 / 8 ) x 100%
= 25%
2007-11-18 23:12:00 補充：
$10 is the selling price but not the cost price, so the below is wrong.
參考: My Maths Knowledge
2007-11-19 1:14 am
1.Let the final selling price be $x:
x ( 1 + 25% )( 1 - 25% )
= 0.9365x
2.the profit %
(12.5)(1-20%)
=10
10-2
=8
(2/10)(100%)
=20%
So the profit is 20%
x ( 1 + 25% )( 1 - 25% )
= 0.9365x
2.the profit %
(12.5)(1-20%)
=10
10-2
=8
(2/10)(100%)
=20%
So the profit is 20%
收錄日期: 2021-04-13 14:31:44
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