PSLE A store is having a book sale.
The 1st book is at 15% discount.
The 2nd book is at 30% discount.
The price of the 2nd book should be equal or lower than the price of the 1st book.
Winnie and Albert each bought two books at the sale.
- Winnie's books were priced at $15 and $25. How much did she pay for them?
- Albert paid a total of $57.50 for his two books. He paid $7.10 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% $25 |
100% $15 |
|
Discount |
- 15% |
- 30% |
|
Sale price |
85% |
70% |
? |
(a)
Selling price of the 1st book
= 85% x 25
=
85100 x 25
= $21.25
Selling price of 2nd book
= 70% x 15
=
70100 x 15
= $10.50
Total amount that Winnie paid
= 21.25 + 10.50
= $31.75
|
1st book |
2nd book |
Total amount |
Original price |
100% |
100% |
|
Discount |
- 15% |
- 30% |
|
Sale price |
85%
|
70%
|
|
Compare 1st book and 2nd book |
1 u + $7.10 |
1 u |
$57.50 |
(b)
Sale price of the 1st book = 1 u + 7.10
Sale price of the 2nd book = 1 u
Total amount that Albert paid
= 1 u + 7.10 + 1 u
= 2 u + 7.10
2 u + 7.10 = 57.50
2 u = 57.50 - 7.10
2 u = 50.40
1 u = 50.40 ÷ 2 = 25.20
Sale price of the 2nd book = $25.20
70% of the price = $25.20
100% of the price =
25.2070 x 100 = $36
Selling price of the 2nd book before discount = $36
Answer(s): (a) $31.75; (b) $36