PSLE A stationery kiosk is having a book sale.
The 1st book is at 25% discount.
The 2nd book is at 40% discount.
The price of the 2nd book should be equal or lower than the price of the 1st book.
Tammy and Tom each bought two books at the sale.
- Tammy's books were priced at $17 and $18. How much did she pay for them?
- Tom paid a total of $46.65 for his two books. He paid $11.85 less for the 2nd book than the 1st book. What was the price of the 2nd book before discount?
|
1st book |
2nd book |
Total amount |
Original price
|
100% $18 |
100% $17 |
|
Discount |
- 25% |
- 40% |
|
Sale price |
75% |
60% |
? |
(a)
Selling price of the 1st book
= 75% x 18
=
75100 x 18
= $13.50
Selling price of 2nd book
= 60% x 17
=
60100 x 17
= $10.20
Total amount that Tammy paid
= 13.50 + 10.20
= $23.70
|
1st book |
2nd book |
Total amount |
Original price |
100% |
100% |
|
Discount |
- 25% |
- 40% |
|
Sale price |
75%
|
60%
|
|
Compare 1st book and 2nd book |
1 u + $11.85 |
1 u |
$46.65 |
(b)
Sale price of the 1st book = 1 u + 11.85
Sale price of the 2nd book = 1 u
Total amount that Tom paid
= 1 u + 11.85 + 1 u
= 2 u + 11.85
2 u + 11.85 = 46.65
2 u = 46.65 - 11.85
2 u = 34.80
1 u = 34.80 ÷ 2 = 17.40
Sale price of the 2nd book = $17.40
60% of the price = $17.40
100% of the price =
17.4060 x 100 = $29
Selling price of the 2nd book before discount = $29
Answer(s): (a) $23.70; (b) $29