PSLE A shop 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.
Gem and Ahmad each bought two books at the sale.
- Gem's books were priced at $7 and $16. How much less did she pay for the 2nd book than the 1st book?
- Ahmad paid a total of $54.70 for his two books. He paid $9.90 less for the 2nd book than for the 1st book. What was the price of the 1st book before discount?
|
1st book |
2nd book |
Total amount |
Original price
|
100% $16 |
100% $7 |
|
Discount |
- 5% |
- 30% |
|
Sale price |
95% |
70% |
? |
(a)
Selling price of the 1st book
= 95% x 16
=
95100 x 16
= $15.20
Selling price of 2nd book
= 70% x 7
=
70100 x 7
= $4.90
Amount that Gem paid less for the 2nd book than the 1st book
= 15.20 - 4.90
= $10.30
|
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 + $9.90 |
1 u |
$54.70 |
(b)
Sale price of the 1st book = 1 u + 9.90
Sale price of the 2nd book = 1 u
Total amount that Ahmad paid
= 1 u + 9.90 + 1 u
= 2 u + 9.90
2 u + 9.90 = 54.70
2 u = 54.70 - 9.90
2 u = 44.80
1 u = 44.80 ÷ 2 = 22.40
Sale price of the 1st book
= 1 u + 9.90
= $32.30
95% of the price = $32.30
100% of the price =
32.3095 x 100 = $34
Selling price of the 1st book before discount = $34
Answer(s): (a) $10.30; (b) $34