PSLE A store is having a book sale.
The 1st book is at 15% 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.
Betty and Michael each bought two books at the sale.
- Betty's books were priced at $34 and $34. How much did she pay for them?
- Michael paid a total of $46.65 for his two books. He paid $9.45 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% $34 |
100% $34 |
|
Discount |
- 15% |
- 40% |
|
Sale price |
85% |
60% |
? |
(a)
Selling price of the 1st book
= 85% x 34
=
85100 x 34
= $28.90
Selling price of 2nd book
= 60% x 34
=
60100 x 34
= $20.40
Total amount that Betty paid
= 28.90 + 20.40
= $49.30
|
1st book |
2nd book |
Total amount |
Original price |
100% |
100% |
|
Discount |
- 15% |
- 40% |
|
Sale price |
85%
|
60%
|
|
Compare 1st book and 2nd book |
1 u + $9.45 |
1 u |
$46.65 |
(b)
Sale price of the 1st book = 1 u + 9.45
Sale price of the 2nd book = 1 u
Total amount that Michael paid
= 1 u + 9.45 + 1 u
= 2 u + 9.45
2 u + 9.45 = 46.65
2 u = 46.65 - 9.45
2 u = 37.20
1 u = 37.20 ÷ 2 = 18.60
Sale price of the 2nd book = $18.60
60% of the price = $18.60
100% of the price =
18.6060 x 100 = $31
Selling price of the 2nd book before discount = $31
Answer(s): (a) $49.30; (b) $31