PSLE A bookstore is having a book sale.
The 1st book is at 5% 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.
Jaslyn and Luis each bought two books at the sale.
- Jaslyn's books were priced at $9 and $17. How much did she pay for them?
- Luis paid a total of $53.10 for his two books. He paid $15.30 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% $17 |
100% $9 |
|
Discount |
- 5% |
- 30% |
|
Sale price |
95% |
70% |
? |
(a)
Selling price of the 1st book
= 95% x 17
=
95100 x 17
= $16.15
Selling price of 2nd book
= 70% x 9
=
70100 x 9
= $6.30
Total amount that Jaslyn paid
= 16.15 + 6.30
= $22.45
|
1st book |
2nd book |
Total amount |
Original price |
100% |
100% |
|
Discount |
- 5% |
- 30% |
|
Sale price |
95%
|
70%
|
|
Compare 1st book and 2nd book |
1 u + $15.30 |
1 u |
$53.10 |
(b)
Sale price of the 1st book = 1 u + 15.30
Sale price of the 2nd book = 1 u
Total amount that Luis paid
= 1 u + 15.30 + 1 u
= 2 u + 15.30
2 u + 15.30 = 53.10
2 u = 53.10 - 15.30
2 u = 37.80
1 u = 37.80 ÷ 2 = 18.90
Sale price of the 2nd book = $18.90
70% of the price = $18.90
100% of the price =
18.9070 x 100 = $27
Selling price of the 2nd book before discount = $27
Answer(s): (a) $22.45; (b) $27