PSLE A stationery kiosk is having a book sale.
The 1st book is at 25% discount.
The 2nd book is at 35% discount.
The price of the 2nd book should be equal or lower than the price of the 1st book.
Barbara and Caden each bought two books at the sale.
- Barbara's books were priced at $26 and $37. How much more did she pay for the 1st book than the 2nd book?
- Caden paid a total of $40.80 for his two books. He paid $5.70 more for the 1st book than for the 2nd book. What was the price of the 1st book before discount?
|
1st book |
2nd book |
Total amount |
Original price
|
100% $37 |
100% $26 |
|
Discount |
- 25% |
- 35% |
|
Sale price |
75% |
65% |
? |
(a)
Selling price of the 1st book
= 75% x 37
=
75100 x 37
= $27.75
Selling price of 2nd book
= 65% x 26
=
65100 x 26
= $16.90
Amount that Barbara paid more for the 1st book than the 2nd book
= 27.75 - 16.90
= $10.85
|
1st book |
2nd book |
Total amount |
Original price |
100% |
100% |
|
Discount |
- 25% |
- 35% |
|
Sale price |
75%
|
65%
|
|
Compare 1st book and 2nd book |
1 u + $5.70 |
1 u |
$40.80 |
(b)
Sale price of the 1st book = 1 u + 5.70
Sale price of the 2nd book = 1 u
Total amount that Caden paid
= 1 u + 5.70 + 1 u
= 2 u + 5.70
2 u + 5.70 = 40.80
2 u = 40.80 - 5.70
2 u = 35.10
1 u = 35.10 ÷ 2 = 17.55
Sale price of the 1st book
= 1 u + 5.70
= $23.25
75% of the price = $23.25
100% of the price =
23.2575 x 100 = $31
Selling price of the 1st book before discount = $31
Answer(s): (a) $10.85; (b) $31