1.The selling price of an article is first increased by 25% and then decreased by 25%.What is the final selling price?
A.has increased by 25%
B.has decreased by 25%
C.has decreased
D.remain unchanged
Please Explain Step By Step!
Thank you!
數學的問題!!!!!!!!!!!!!!!!!!!!!!!!!!
2007-11-19 5:17 am
回答 (4)
2007-11-19 5:21 am
✔ 最佳答案
The answer is C.Let the original selling price is x.
After increasing 25% and decreasing by 25%, the final selling price is
x(1+25%)(1-25%) = x(1.25)(0.75)
= 0.9375x
=(1-0.0625)x
Hence the final selling price is decreased by 6.25%
2007-11-19 5:36 am
我知______try this:
50,000 x 1.25 x 0.75 = 46,875
50,000 is the selling price
1.25 = increased by 25%
0.75 = decreased by 25%
the answer is C = 'has decreased"
50,000 x 1.25 = 62,500 new selling price (1)
62,500 x 0.75 = 46,875 new selling price (2)
(1) & (2) has different selling prices so (A) & (B) are wrong.
hope this helps.
50,000 x 1.25 x 0.75 = 46,875
50,000 is the selling price
1.25 = increased by 25%
0.75 = decreased by 25%
the answer is C = 'has decreased"
50,000 x 1.25 = 62,500 new selling price (1)
62,500 x 0.75 = 46,875 new selling price (2)
(1) & (2) has different selling prices so (A) & (B) are wrong.
hope this helps.
2007-11-19 5:32 am
let the original price be X,
the final selling price be X
X = X,(1.25)(0.75)
= 0.9375X,
because X is smaller than X,
so the answer is B
2007-11-18 21:34:31 補充：
sorry, the answer is C,not Bbut the calculation is correct!!
the final selling price be X
X = X,(1.25)(0.75)
= 0.9375X,
because X is smaller than X,
so the answer is B
2007-11-18 21:34:31 補充：
sorry, the answer is C,not Bbut the calculation is correct!!
2007-11-19 5:26 am
try this:
50,000 x 1.25 x 0.75 = 46,875
50,000 is the selling price
1.25 = increased by 25%
0.75 = decreased by 25%
the answer is C = 'has decreased"
50,000 x 1.25 = 62,500 new selling price (1)
62,500 x 0.75 = 46,875 new selling price (2)
(1) & (2) has different selling prices so (A) & (B) are wrong.
hope this helps.
50,000 x 1.25 x 0.75 = 46,875
50,000 is the selling price
1.25 = increased by 25%
0.75 = decreased by 25%
the answer is C = 'has decreased"
50,000 x 1.25 = 62,500 new selling price (1)
62,500 x 0.75 = 46,875 new selling price (2)
(1) & (2) has different selling prices so (A) & (B) are wrong.
hope this helps.
收錄日期: 2021-04-13 14:32:11
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071118000051KK04858