1. Ronald and Edmond buy same product at the same price in shop A and shop B respectively.If Ronald saves $18 at a discount of 25%, find the selling price of the product in shop A.If Edmond only saves $13.5 when he buys the product in shop B, find the percentage discount offered by shop B.
2. The cost of an electrical appliance is $1000. The shop ower marked it at 60% highter than the cost. The shop ower is adjusting the marked price of the electrical appliance such that its selling price will still be the same as the original marked price when it is sold at a 20% discount. Find the percentage increase in the marked price.
3. The marked price of a bookshelf is 65% highter than its cost. It is known that the bookshelf is sold at 60% off and the discount is $792. Find the percentage loss of the bookshelf.
4. Susan bought a T-shirt marked $120 at a discount of 40%, a pair of jeans marked $180 at a discount of 20%, and a jacket marked $300 at a certain discount. Since Susan paid the bill by credit card, she could have an extra discount of 10% and the amount she paid was $437.4.
(a) If Susan paid the bill by cash, how much should she pay?
(b)Find the percentege discount of the jacket.
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Maths discount
2012-12-10 7:21 am
回答 (2)
2012-12-10 7:42 am
✔ 最佳答案
稍後補答 稍後補答 稍後補答 稍後補答 2012-12-09 23:57:19 補充：
1. the marked price of the product
=$18/25%=$72
the selling price of the product
=$72x(1-25%)=$54
the percentage discount offered by shop b
=13/72x100%=18.1%(3sig.fig.)
2. the oringin market price=1000(1+60%)=$1600
the new market price=1000/(1-20%)=$1250
2012-12-09 23:57:40 補充：
the percentage increase in the marked price
=(1250-1000)/1000 x100%=25%
3.the market price
=792/60%=$1320
the selling price
=1320-792=$528
the cost
=1320/(1+65%)=800
the percentage loss
=(800-528)/800x100%=34%
2012-12-09 23:57:45 補充：
4.(a) she should pay 437.4/(1-10%)=$486
(b)Let x% be the percentage discount
120x(1-40%)+180x(1-20%)+300x(1-x%)=486
300(1-x%)=270
1-x%=0.9
x%=10
the percentage discount is 10%.
2012-12-09 23:59:10 補充：
1-x%=0.9
x%=0.1
x=10
2012-12-10 8:48 am
1.
Edmond saves $13.5, but NOT $13.
Edmond saves $13.5, but NOT $13.
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