form 1 maths

NgFion

2010-12-01 4:57 am

(1) Ronald and Edmond buy the same product at the same price in shop A and shop B respesctively.
(a) If Ronald saves $18 at a discount of 25%. find the selling price of the product in shop A
(B) If Edmond only saves $13.5 when he buys the product in shop B , find the perecntage discount offered by shop B

(2) The cost of an electrical appliance is $1000 , The shop owner market it at 60% higher than the cost.
(a) find the marked price of the electrical appliance.
(b) the shop owner 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.

回答 (1)

Acct

2010-12-01 5:30 am

✔ 最佳答案

Q 1
(a) Let A be price of shop A
A x 25% = 18
A = 72

(b) As price of shop A = shop B
Let Y% be the discount rate
A x Y = 13.5
Y = 13.5 / A
Y = 13.5/72
= 18.75%

Q 2
(a) $1000 x (1 + 60%) = 1600

Let Y% be the discount rate
(b) $1600 x (1 - 20%) x (1+Y) = 1600
1600 x 0.8 x (1+Y) = 1600
Y = 25%

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