PSLE A shop is having a book sale.
The 1st book is at 5% discount.
The 2nd book is at 30% discount.
The price of the 2nd book should be equal or lower than the price of the 1st book.
Gillian and Peter each bought two books at the sale.
- Gillian's books were priced at $7 and $19. How much did she pay for them?
- Peter paid a total of $41.50 for his two books. He paid $7.90 more for the 1st book than the 2nd book. What was the price of the 2nd book before discount?
|
1st book |
2nd book |
Total amount |
Original price
|
100% $19 |
100% $7 |
|
Discount |
- 5% |
- 30% |
|
Sale price |
95% |
70% |
? |
(a)
Selling price of the 1st book
= 95% x 19
=
95100 x 19
= $18.05
Selling price of 2nd book
= 70% x 7
=
70100 x 7
= $4.90
Total amount that Gillian paid
= 18.05 + 4.90
= $22.95
|
1st book |
2nd book |
Total amount |
Original price |
100% |
100% |
|
Discount |
- 5% |
- 30% |
|
Sale price |
95%
|
70%
|
|
Compare 1st book and 2nd book |
1 u + $7.90 |
1 u |
$41.50 |
(b)
Sale price of the 1st book = 1 u + 7.90
Sale price of the 2nd book = 1 u
Total amount that Peter paid
= 1 u + 7.90 + 1 u
= 2 u + 7.90
2 u + 7.90 = 41.50
2 u = 41.50 - 7.90
2 u = 33.60
1 u = 33.60 ÷ 2 = 16.80
Sale price of the 2nd book = $16.80
70% of the price = $16.80
100% of the price =
16.8070 x 100 = $24
Selling price of the 2nd book before discount = $24
Answer(s): (a) $22.95; (b) $24