PSLE A bookstore is having a book sale.
The 1st book is at 5% 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.
Fiona and Gabriel each bought two books at the sale.
- Fiona's books were priced at $14 and $28. How much more did she pay for the 1st book than the 2nd book?
- Gabriel paid a total of $29.30 for his two books. He paid $12.50 less for the 2nd book than for the 1st book. What was the price of the 1st book before discount?
|
1st book |
2nd book |
Total amount |
Original price
|
100% $28 |
100% $14 |
|
Discount |
- 5% |
- 40% |
|
Sale price |
95% |
60% |
? |
(a)
Selling price of the 1st book
= 95% x 28
=
95100 x 28
= $26.60
Selling price of 2nd book
= 60% x 14
=
60100 x 14
= $8.40
Amount that Fiona paid more for the 1st book than the 2nd book
= 26.60 - 8.40
= $18.20
|
1st book |
2nd book |
Total amount |
Original price |
100% |
100% |
|
Discount |
- 5% |
- 40% |
|
Sale price |
95%
|
60%
|
|
Compare 1st book and 2nd book |
1 u + $12.50 |
1 u |
$29.30 |
(b)
Sale price of the 1st book = 1 u + 12.50
Sale price of the 2nd book = 1 u
Total amount that Gabriel paid
= 1 u + 12.50 + 1 u
= 2 u + 12.50
2 u + 12.50 = 29.30
2 u = 29.30 - 12.50
2 u = 16.80
1 u = 16.80 ÷ 2 = 8.40
Sale price of the 1st book
= 1 u + 12.50
= $20.90
95% of the price = $20.90
100% of the price =
20.9095 x 100 = $22
Selling price of the 1st book before discount = $22
Answer(s): (a) $18.20; (b) $22