PSLE A bookstore is having a book sale.
The 1st book is at 25% discount.
The 2nd book is at 35% discount.
The price of the 2nd book should be equal or lower than the price of the 1st book.
Jaslyn and Vaidev each bought two books at the sale.
- Jaslyn's books were priced at $28 and $30. How much did she pay for them?
- Vaidev paid a total of $31.85 for his two books. He paid $7.15 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% $28 |
|
Discount |
- 25% |
- 35% |
|
Sale price |
75% |
65% |
? |
(a)
Selling price of the 1st book
= 75% x 30
=
75100 x 30
= $22.50
Selling price of 2nd book
= 65% x 28
=
65100 x 28
= $18.20
Total amount that Jaslyn paid
= 22.50 + 18.20
= $40.70
|
1st book |
2nd book |
Total amount |
Original price |
100% |
100% |
|
Discount |
- 25% |
- 35% |
|
Sale price |
75%
|
65%
|
|
Compare 1st book and 2nd book |
1 u + $7.15 |
1 u |
$31.85 |
(b)
Sale price of the 1st book = 1 u + 7.15
Sale price of the 2nd book = 1 u
Total amount that Vaidev paid
= 1 u + 7.15 + 1 u
= 2 u + 7.15
2 u + 7.15 = 31.85
2 u = 31.85 - 7.15
2 u = 24.70
1 u = 24.70 ÷ 2 = 12.35
Sale price of the 2nd book = $12.35
65% of the price = $12.35
100% of the price =
12.3565 x 100 = $19
Selling price of the 2nd book before discount = $19
Answer(s): (a) $40.70; (b) $19