PSLE A book shop is having a book sale.
The 1st book is at 10% 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.
Ivory and Tommy each bought two books at the sale.
- Ivory's books were priced at $23 and $36. How much did she pay for them?
- Tommy paid a total of $29.80 for his two books. He paid $11.60 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% $36 |
100% $23 |
|
Discount |
- 10% |
- 30% |
|
Sale price |
90% |
70% |
? |
(a)
Selling price of the 1st book
= 90% x 36
=
90100 x 36
= $32.40
Selling price of 2nd book
= 70% x 23
=
70100 x 23
= $16.10
Total amount that Ivory paid
= 32.40 + 16.10
= $48.50
|
1st book |
2nd book |
Total amount |
Original price |
100% |
100% |
|
Discount |
- 10% |
- 30% |
|
Sale price |
90%
|
70%
|
|
Compare 1st book and 2nd book |
1 u + $11.60 |
1 u |
$29.80 |
(b)
Sale price of the 1st book = 1 u + 11.60
Sale price of the 2nd book = 1 u
Total amount that Tommy paid
= 1 u + 11.60 + 1 u
= 2 u + 11.60
2 u + 11.60 = 29.80
2 u = 29.80 - 11.60
2 u = 18.20
1 u = 18.20 ÷ 2 = 9.10
Sale price of the 2nd book = $9.10
70% of the price = $9.10
100% of the price =
9.1070 x 100 = $13
Selling price of the 2nd book before discount = $13
Answer(s): (a) $48.50; (b) $13