PSLE A shop is having a book sale.
The 1st book is at 5% discount.
The 2nd book is at 10% discount.
The price of the 2nd book should be equal or lower than the price of the 1st book.
Min and Valen each bought two books at the sale.
- Min's books were priced at $37 and $38. How much did she pay for them?
- Valen paid a total of $36.20 for his two books. He paid $5.60 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% $38 |
100% $37 |
|
Discount |
- 5% |
- 10% |
|
Sale price |
95% |
90% |
? |
(a)
Selling price of the 1st book
= 95% x 38
=
95100 x 38
= $36.10
Selling price of 2nd book
= 90% x 37
=
90100 x 37
= $33.30
Total amount that Min paid
= 36.10 + 33.30
= $69.40
|
1st book |
2nd book |
Total amount |
Original price |
100% |
100% |
|
Discount |
- 5% |
- 10% |
|
Sale price |
95%
|
90%
|
|
Compare 1st book and 2nd book |
1 u + $5.60 |
1 u |
$36.20 |
(b)
Sale price of the 1st book = 1 u + 5.60
Sale price of the 2nd book = 1 u
Total amount that Valen paid
= 1 u + 5.60 + 1 u
= 2 u + 5.60
2 u + 5.60 = 36.20
2 u = 36.20 - 5.60
2 u = 30.60
1 u = 30.60 ÷ 2 = 15.30
Sale price of the 2nd book = $15.30
90% of the price = $15.30
100% of the price =
15.3090 x 100 = $17
Selling price of the 2nd book before discount = $17
Answer(s): (a) $69.40; (b) $17