PSLE A stationery kiosk is having a book sale.
The 1st book is at 10% discount.
The 2nd book is at 20% discount.
The price of the 2nd book should be equal or lower than the price of the 1st book.
Shiyun and Japheth each bought two books at the sale.
- Shiyun's books were priced at $21 and $29. How much did she pay for them?
- Japheth paid a total of $52.10 for his two books. He paid $7.30 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% $29 |
100% $21 |
|
Discount |
- 10% |
- 20% |
|
Sale price |
90% |
80% |
? |
(a)
Selling price of the 1st book
= 90% x 29
=
90100 x 29
= $26.10
Selling price of 2nd book
= 80% x 21
=
80100 x 21
= $16.80
Total amount that Shiyun paid
= 26.10 + 16.80
= $42.90
|
1st book |
2nd book |
Total amount |
Original price |
100% |
100% |
|
Discount |
- 10% |
- 20% |
|
Sale price |
90%
|
80%
|
|
Compare 1st book and 2nd book |
1 u + $7.30 |
1 u |
$52.10 |
(b)
Sale price of the 1st book = 1 u + 7.30
Sale price of the 2nd book = 1 u
Total amount that Japheth paid
= 1 u + 7.30 + 1 u
= 2 u + 7.30
2 u + 7.30 = 52.10
2 u = 52.10 - 7.30
2 u = 44.80
1 u = 44.80 ÷ 2 = 22.40
Sale price of the 2nd book = $22.40
80% of the price = $22.40
100% of the price =
22.4080 x 100 = $28
Selling price of the 2nd book before discount = $28
Answer(s): (a) $42.90; (b) $28