PSLE A store is having a book sale. The 1st book is at 5% 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.
- Mary's books were priced at $35 and $39. How much did she pay for them?
- Oscar paid a total of $52.15 for his two books. He paid $8.65 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% $39 |
100% $35 |
|
Discount |
- 5% |
- 25% |
|
Sale price |
95% |
75% |
? |
(a)
Selling price of the 1st book
= 95% x 39
=
95100 x 39
= $37.05
Selling price of 2nd book
= 75% x 35
=
75100 x 35
= $26.25
Total amount that Mary paid
= 37.05 + 26.25
= $63.30
|
1st book |
2nd book |
Total amount |
Original price |
100% |
100% |
|
Discount |
- 5% |
- 25% |
|
Sale price |
95%
|
75%
|
|
Compare 1st book and 2nd book |
1 u + $8.65 |
1 u |
$52.15 |
(b)
Sale price of the 1st book = 1 u + 8.65
Sale price of the 2nd book = 1 u
Total amount that Oscar paid
= 1 u + 8.65 + 1 u
= 2 u + 8.65
2 u + 8.65 = 52.15
2 u = 52.15 - 8.65
2 u = 43.50
1 u = 43.50 ÷ 2 = 21.75
Sale price of the 2nd book = $21.75
75% of the price = $21.75
100% of the price =
21.7575 x 100 = $29
Selling price of the 2nd book before discount = $29
Answer(s): (a) $63.30; (b) $29