PSLE A stationery kiosk is having a book sale. The 1st book is at 20% discount. The 2nd book is at 25% discount. The price of the 2nd book should be equal or lower than the price of the 1st book.
- Shiyun's books were priced at $10 and $18. How much did she pay for them?
- Will paid a total of $41.95 for his two books. He paid $4.45 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% $18 |
100% $10 |
|
Discount |
- 20% |
- 25% |
|
Sale price |
80% |
75% |
? |
(a)
Selling price of the 1st book
= 80% x 18
=
80100 x 18
= $14.40
Selling price of 2nd book
= 75% x 10
=
75100 x 10
= $7.50
Total amount that Shiyun paid
= 14.40 + 7.50
= $21.90
|
1st book |
2nd book |
Total amount |
Original price |
100% |
100% |
|
Discount |
- 20% |
- 25% |
|
Sale price |
80%
|
75%
|
|
Compare 1st book and 2nd book |
1 u + $4.45 |
1 u |
$41.95 |
(b)
Sale price of the 1st book = 1 u + 4.45
Sale price of the 2nd book = 1 u
Total amount that Will paid
= 1 u + 4.45 + 1 u
= 2 u + 4.45
2 u + 4.45 = 41.95
2 u = 41.95 - 4.45
2 u = 37.50
1 u = 37.50 ÷ 2 = 18.75
Sale price of the 2nd book = $18.75
75% of the price = $18.75
100% of the price =
18.7575 x 100 = $25
Selling price of the 2nd book before discount = $25
Answer(s): (a) $21.90; (b) $25