PSLE A stationery kiosk 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.
- Esther's books were priced at $5 and $13. How much did she pay for them?
- Luis paid a total of $31.65 for his two books. He paid $10.85 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% $13 |
100% $5 |
|
Discount |
- 15% |
- 35% |
|
Sale price |
85% |
65% |
? |
(a)
Selling price of the 1st book
= 85% x 13
=
85100 x 13
= $11.05
Selling price of 2nd book
= 65% x 5
=
65100 x 5
= $3.25
Total amount that Esther paid
= 11.05 + 3.25
= $14.30
|
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 + $10.85 |
1 u |
$31.65 |
(b)
Sale price of the 1st book = 1 u + 10.85
Sale price of the 2nd book = 1 u
Total amount that Luis paid
= 1 u + 10.85 + 1 u
= 2 u + 10.85
2 u + 10.85 = 31.65
2 u = 31.65 - 10.85
2 u = 20.80
1 u = 20.80 ÷ 2 = 10.40
Sale price of the 2nd book = $10.40
65% of the price = $10.40
100% of the price =
10.4065 x 100 = $16
Selling price of the 2nd book before discount = $16
Answer(s): (a) $14.30; (b) $16