PSLE A book 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.
Jaslyn and Daniel each bought two books at the sale.
- Jaslyn's books were priced at $21 and $22. How much did she pay for them?
- Daniel paid a total of $27.05 for his two books. He paid $7.45 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% $22 |
100% $21 |
|
Discount |
- 25% |
- 30% |
|
Sale price |
75% |
70% |
? |
(a)
Selling price of the 1st book
= 75% x 22
=
75100 x 22
= $16.50
Selling price of 2nd book
= 70% x 21
=
70100 x 21
= $14.70
Total amount that Jaslyn paid
= 16.50 + 14.70
= $31.20
|
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 + $7.45 |
1 u |
$27.05 |
(b)
Sale price of the 1st book = 1 u + 7.45
Sale price of the 2nd book = 1 u
Total amount that Daniel paid
= 1 u + 7.45 + 1 u
= 2 u + 7.45
2 u + 7.45 = 27.05
2 u = 27.05 - 7.45
2 u = 19.60
1 u = 19.60 ÷ 2 = 9.80
Sale price of the 2nd book = $9.80
70% of the price = $9.80
100% of the price =
9.8070 x 100 = $14
Selling price of the 2nd book before discount = $14
Answer(s): (a) $31.20; (b) $14