數學問題一條

a)設A為微波爐標價

(A x 0.9) - 600 = A x (1-35%)
0.9A -600 = 0.65A
0.25A = 600
A = 2400

微波爐標價為2400元

b) 2400-1800 = 600

盈利為600元

2006-10-20 16:19:11 補充：
b) (((2400 x 0.8) - 1800) / 1800) x 100% = 6.66%

a. 設微波爐的標價為 $y

(y x 0.9) - 600 = y x (1-35%)
0.9y - 600 = 0.65y
0.25y = 600
y = 600 / 0.25
y = 2400

微波爐的標價為 $2400

b) 新的微波爐售價為：
$2400 x 80% = $1920

盈利為：$1920 - $1800 = $120

盈利的百分率：
($120 / $1800) x 100% = 20/3 % = 6 2/3%

a)設微波爐的標價X元
0.9X - 0.65X = 600
0.25X = 600
X=2400

b)2400x80%-1800/1800
=6.67%
盈利百分之六點六七

1) 微波爐的標價設為 Y

公式為以下,
Y x 90% = Y (1-35%) + 600
0.9Y = 0.65Y +600
0.25Y = 600
Y = 2400

所以微波爐的標價為 $2400

2) 現在 微波爐的標價為 $2400 ,以八折出售
$2400 x 80% = $1920

求盈利 / 虧蝕的百分率 : ( $1920 - $1800 ) /$1800 x 100% = $120 / $1800 x100%
= 6.67%
盈利為 6.67%

a. Let x be the oven's price
0.9x-(1-0.35)x=600
0.25x=600
x=2400

so the oven's price is $2400

b. The percentage of profit = (2400*0.8-1800)/1800 x 100%
= 120/18%
= 6.66666... or 6 2/3 %

a.$2400
b. 6.6666....