PSLE
Cathy wanted to buy a vest. She saw a pink vest on sale at 10% discount and a green vest at 20% discount. Both vests had the same original price before the discounts. To buy the pink vest, Cathy would need $9.30 more that what she had. So Cathy bought the green vest. After that, she had $4 left.

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

	Pink vest	Green vest
Before	100%	100%
Change	- 10%	- 20%
After	90%	80%

(a)
Difference in the discount between the pink vest and the green vest
= 20% - 10%
= 10%

Additional amount that Cathy needed to pay if she would buy the pink vest
= 9.30 + 4
= $13.30

10% →  13.30
100% → ^13.30₁₀ x 100 = 133

Original price of the pink vest = $133

(b)
Price of the green vest after discount in percentage
= 100% - 20%
= 80%

Price of the green vest after discount
= ⁸⁰₁₀₀ x 133
= $106.40

Amount that Cathy had at first
= 106.40 + 4
= $110.40

Answer(s): (a) $133; (b) $110.40