PSLE A shop is having a book sale. The 1st book is at 15% 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.
- Yen's books were priced at $16 and $30. How much did she pay for them?
- Billy paid a total of $36.60 for his two books. He paid $9.30 less for the 2nd book than the 1st book. What was the price of the 2nd book before discount?
|
1st book |
2nd book |
Total amount |
Original price
|
100% $30 |
100% $16 |
|
Discount |
- 15% |
- 35% |
|
Sale price |
85% |
65% |
? |
(a)
Selling price of the 1st book
= 85% x 30
=
85100 x 30
= $25.50
Selling price of 2nd book
= 65% x 16
=
65100 x 16
= $10.40
Total amount that Yen paid
= 25.50 + 10.40
= $35.90
|
1st book |
2nd book |
Total amount |
Original price |
100% |
100% |
|
Discount |
- 15% |
- 35% |
|
Sale price |
85%
|
65%
|
|
Compare 1st book and 2nd book |
1 u + $9.30 |
1 u |
$36.60 |
(b)
Sale price of the 1st book = 1 u + 9.30
Sale price of the 2nd book = 1 u
Total amount that Billy paid
= 1 u + 9.30 + 1 u
= 2 u + 9.30
2 u + 9.30 = 36.60
2 u = 36.60 - 9.30
2 u = 27.30
1 u = 27.30 ÷ 2 = 13.65
Sale price of the 2nd book = $13.65
65% of the price = $13.65
100% of the price =
13.6565 x 100 = $21
Selling price of the 2nd book before discount = $21
Answer(s): (a) $35.90; (b) $21