PSLE
Sarah wanted to buy a sweater. She saw a green sweater on sale at 25% discount and a blue sweater at 40% discount. Both sweaters had the same original price before the discounts. To buy the green sweater, Sarah would need $4.20 more that what she had. So Sarah bought the blue sweater. After that, she had $3 left.

1. What was the original price of the green sweater?
2. How much money did Sarah have at first?

	Green sweater	Blue sweater
Before	100%	100%
Change	- 25%	- 40%
After	75%	60%

(a)
Difference in the discount between the green sweater and the blue sweater
= 40% - 25%
= 15%

Additional amount that Sarah needed to pay if she would buy the green sweater
= 4.20 + 3
= $7.20

15% →  7.20
100% → ^7.20₁₅ x 100 = 48

Original price of the green sweater = $48

(b)
Price of the blue sweater after discount in percentage
= 100% - 40%
= 60%

Price of the blue sweater after discount
= ⁶⁰₁₀₀ x 48
= $28.80

Amount that Sarah had at first
= 28.80 + 3
= $31.80

Answer(s): (a) $48; (b) $31.80