PSLE
Risa wanted to buy a vest. She saw a yellow vest on sale at 25% discount and a grey vest at 40% discount. Both vests had the same original price before the discounts. To buy the yellow vest, Risa would need $4.90 more that what she had. So Risa bought the grey vest. After that, she had $20 left.

1. What was the original price of the yellow vest?
2. How much money did Risa have at first?

	Yellow vest	Grey vest
Before	100%	100%
Change	- 25%	- 40%
After	75%	60%

(a)
Difference in the discount between the yellow vest and the grey vest
= 40% - 25%
= 15%

Additional amount that Risa needed to pay if she would buy the yellow vest
= 4.90 + 20
= $24.90

15% →  24.90
100% → ^24.90₁₅ x 100 = 166

Original price of the yellow vest = $166

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

Price of the grey vest after discount
= ⁶⁰₁₀₀ x 166
= $99.60

Amount that Risa had at first
= 99.60 + 20
= $119.60

Answer(s): (a) $166; (b) $119.60