PSLE A store is having a book sale.
The 1st book is at 15% discount.
The 2nd book is at 20% discount.
The price of the 2nd book should be equal or lower than the price of the 1st book.
Winnie and Bobby each bought two books at the sale.
- Winnie's books were priced at $18 and $30. How much did she pay for them?
- Bobby paid a total of $50.50 for his two books. He paid $7.30 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% $30 |
100% $18 |
|
Discount |
- 15% |
- 20% |
|
Sale price |
85% |
80% |
? |
(a)
Selling price of the 1st book
= 85% x 30
=
85100 x 30
= $25.50
Selling price of 2nd book
= 80% x 18
=
80100 x 18
= $14.40
Total amount that Winnie paid
= 25.50 + 14.40
= $39.90
|
1st book |
2nd book |
Total amount |
Original price |
100% |
100% |
|
Discount |
- 15% |
- 20% |
|
Sale price |
85%
|
80%
|
|
Compare 1st book and 2nd book |
1 u + $7.30 |
1 u |
$50.50 |
(b)
Sale price of the 1st book = 1 u + 7.30
Sale price of the 2nd book = 1 u
Total amount that Bobby paid
= 1 u + 7.30 + 1 u
= 2 u + 7.30
2 u + 7.30 = 50.50
2 u = 50.50 - 7.30
2 u = 43.20
1 u = 43.20 ÷ 2 = 21.60
Sale price of the 2nd book = $21.60
80% of the price = $21.60
100% of the price =
21.6080 x 100 = $27
Selling price of the 2nd book before discount = $27
Answer(s): (a) $39.90; (b) $27