PSLE A shop 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.
Julie and Zane each bought two books at the sale.
- Julie's books were priced at $7 and $11. How much did she pay for them?
- Zane paid a total of $41.10 for his two books. He paid $9.90 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% $11 |
100% $7 |
|
Discount |
- 25% |
- 40% |
|
Sale price |
75% |
60% |
? |
(a)
Selling price of the 1st book
= 75% x 11
=
75100 x 11
= $8.25
Selling price of 2nd book
= 60% x 7
=
60100 x 7
= $4.20
Total amount that Julie paid
= 8.25 + 4.20
= $12.45
|
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 + $9.90 |
1 u |
$41.10 |
(b)
Sale price of the 1st book = 1 u + 9.90
Sale price of the 2nd book = 1 u
Total amount that Zane paid
= 1 u + 9.90 + 1 u
= 2 u + 9.90
2 u + 9.90 = 41.10
2 u = 41.10 - 9.90
2 u = 31.20
1 u = 31.20 ÷ 2 = 15.60
Sale price of the 2nd book = $15.60
60% of the price = $15.60
100% of the price =
15.6060 x 100 = $26
Selling price of the 2nd book before discount = $26
Answer(s): (a) $12.45; (b) $26