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.
Zara and Neave each bought two books at the sale.
- Zara's books were priced at $15 and $21. How much did she pay for them?
- Neave paid a total of $32.30 for his two books. He paid $6.80 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% $21 |
100% $15 |
|
Discount |
- 15% |
- 25% |
|
Sale price |
85% |
75% |
? |
(a)
Selling price of the 1st book
= 85% x 21
=
85100 x 21
= $17.85
Selling price of 2nd book
= 75% x 15
=
75100 x 15
= $11.25
Total amount that Zara paid
= 17.85 + 11.25
= $29.10
|
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 + $6.80 |
1 u |
$32.30 |
(b)
Sale price of the 1st book = 1 u + 6.80
Sale price of the 2nd book = 1 u
Total amount that Neave paid
= 1 u + 6.80 + 1 u
= 2 u + 6.80
2 u + 6.80 = 32.30
2 u = 32.30 - 6.80
2 u = 25.50
1 u = 25.50 ÷ 2 = 12.75
Sale price of the 2nd book = $12.75
75% of the price = $12.75
100% of the price =
12.7575 x 100 = $17
Selling price of the 2nd book before discount = $17
Answer(s): (a) $29.10; (b) $17