簡單數學...急要答案!!!

(a) Selling price = Marked price * (1 - discount rate)
= $320 * (1 - 30%)
= $320 * 0.7
= $224

The selling price is $224.


(b) Discount = Marked price - Selling price
= $320 - $224
= $96

Discount = Cost price * 48%
=> Cost price = Discount / 48% = $96 / 0.48 = $200

Profit rate = Profit / Cost price * 100%
= (Selling price - Cost price) / Cost price * 100%
= (224 - 200) / 200 * 100%
= 24 / 200 * 100%
= 12%

The profit percent is 12%.

10.7
10.7

a)

selling price = 320 * (1 - 0.3 ) = 224

b)
discount = 320 * 0.3 = 96

cost * 0.48 = 96
cost = 96 / 0.48
cost = 200

2007-11-27 21:02:34 補充：
profit % = (selling price - cost) / selling price * 100%= (320-200)/320 * 100%= 37.5%

2007-11-27 21:04:00 補充：
對唔住, 計錯profit % = (selling price - cost) / selling price * 100%= (224-200)/224 * 100%= 10.71%

(a) 320x(1-30%) = $224
(b) Let the cost price be $x
x(48%) = 320x30%
x = 200$
Profit per cent = (224-200)/224 x100% =10.7% (3 sig. fig.)

2007-11-27 21:00:24 補充：
Profit per cent = (224-200)/200 x100% =12%咁樣先岩=]