PSLE A store is having a book sale.
The 1st book is at 15% discount.
The 2nd book is at 25% discount.
The price of the 2nd book should be equal or lower than the price of the 1st book.
Barbara and Tommy each bought two books at the sale.
- Barbara's books were priced at $1 and $11. How much did she pay for them?
- Tommy paid a total of $29.95 for his two books. He paid $7.45 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% $11 |
100% $1 |
|
Discount |
- 15% |
- 25% |
|
Sale price |
85% |
75% |
? |
(a)
Selling price of the 1st book
= 85% x 11
=
85100 x 11
= $9.35
Selling price of 2nd book
= 75% x 1
=
75100 x 1
= $0.75
Total amount that Barbara paid
= 9.35 + 0.75
= $10.10
|
1st book |
2nd book |
Total amount |
Original price |
100% |
100% |
|
Discount |
- 15% |
- 25% |
|
Sale price |
85%
|
75%
|
|
Compare 1st book and 2nd book |
1 u + $7.45 |
1 u |
$29.95 |
(b)
Sale price of the 1st book = 1 u + 7.45
Sale price of the 2nd book = 1 u
Total amount that Tommy paid
= 1 u + 7.45 + 1 u
= 2 u + 7.45
2 u + 7.45 = 29.95
2 u = 29.95 - 7.45
2 u = 22.50
1 u = 22.50 ÷ 2 = 11.25
Sale price of the 2nd book = $11.25
75% of the price = $11.25
100% of the price =
11.2575 x 100 = $15
Selling price of the 2nd book before discount = $15
Answer(s): (a) $10.10; (b) $15