PSLE A stationery shop is having a book sale.
The 1st book is at 25% 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.
Sarah and Oscar each bought two books at the sale.
- Sarah's books were priced at $18 and $26. How much did she pay for them?
- Oscar paid a total of $41.55 for his two books. He paid $7.95 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% $26 |
100% $18 |
|
Discount |
- 25% |
- 30% |
|
Sale price |
75% |
70% |
? |
(a)
Selling price of the 1st book
= 75% x 26
=
75100 x 26
= $19.50
Selling price of 2nd book
= 70% x 18
=
70100 x 18
= $12.60
Total amount that Sarah paid
= 19.50 + 12.60
= $32.10
|
1st book |
2nd book |
Total amount |
Original price |
100% |
100% |
|
Discount |
- 25% |
- 30% |
|
Sale price |
75%
|
70%
|
|
Compare 1st book and 2nd book |
1 u + $7.95 |
1 u |
$41.55 |
(b)
Sale price of the 1st book = 1 u + 7.95
Sale price of the 2nd book = 1 u
Total amount that Oscar paid
= 1 u + 7.95 + 1 u
= 2 u + 7.95
2 u + 7.95 = 41.55
2 u = 41.55 - 7.95
2 u = 33.60
1 u = 33.60 ÷ 2 = 16.80
Sale price of the 2nd book = $16.80
70% of the price = $16.80
100% of the price =
16.8070 x 100 = $24
Selling price of the 2nd book before discount = $24
Answer(s): (a) $32.10; (b) $24