PSLE A stationery kiosk is having a book sale.
The 1st book is at 15% discount.
The 2nd book is at 40% discount.
The price of the 2nd book should be equal or lower than the price of the 1st book.
Mary and Warren each bought two books at the sale.
- Mary's books were priced at $2 and $16. How much did she pay for them?
- Warren paid a total of $50.90 for his two books. He paid $13.70 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% $16 |
100% $2 |
|
Discount |
- 15% |
- 40% |
|
Sale price |
85% |
60% |
? |
(a)
Selling price of the 1st book
= 85% x 16
=
85100 x 16
= $13.60
Selling price of 2nd book
= 60% x 2
=
60100 x 2
= $1.20
Total amount that Mary paid
= 13.60 + 1.20
= $14.80
|
1st book |
2nd book |
Total amount |
Original price |
100% |
100% |
|
Discount |
- 15% |
- 40% |
|
Sale price |
85%
|
60%
|
|
Compare 1st book and 2nd book |
1 u + $13.70 |
1 u |
$50.90 |
(b)
Sale price of the 1st book = 1 u + 13.70
Sale price of the 2nd book = 1 u
Total amount that Warren paid
= 1 u + 13.70 + 1 u
= 2 u + 13.70
2 u + 13.70 = 50.90
2 u = 50.90 - 13.70
2 u = 37.20
1 u = 37.20 ÷ 2 = 18.60
Sale price of the 2nd book = $18.60
60% of the price = $18.60
100% of the price =
18.6060 x 100 = $31
Selling price of the 2nd book before discount = $31
Answer(s): (a) $14.80; (b) $31