英文數學功課,幫幫我吧

1.The marked price of shoes was $450 and it was sold at $360.Find the discount per cent.
（鞋的標價為 $540，並以 $360 賣出。計算折扣百分率。）

Discount per cent
= [(450 - 360)/450] x 100%
= 20%


2.A box of model with marked price of $600 is sold at 10% less.
（一盒模型的標價為 $600，減價 10% 賣出。）
(a)Find the discount. （計算折扣值。）
(b)Find the selling price.（計算售價。）

(a)
Discount
= $600 x 10%
= $60

(b)
Selling price
= $(600 - 60)
= $540

a) the discount percent is 80% .

360/450 x 100 % = 8

check : 450 x 80% = 360

b) the selling price is $540 .

600 x 90% = 540


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