數學的問題!!!!!!!!!!!!!!!!!!!!!!!!!!

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%

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.

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!!

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.