PSLE
Nicole wanted to buy a vest. She saw a brown vest on sale at 10% discount and a black vest at 20% discount. Both vests had the same original price before the discounts. To buy the brown vest, Nicole would need $8.40 more that what she had. So Nicole bought the black vest. After that, she had $4 left.

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

	Brown vest	Black vest
Before	100%	100%
Change	- 10%	- 20%
After	90%	80%

(a)
Difference in the discount between the brown vest and the black vest
= 20% - 10%
= 10%

Additional amount that Nicole needed to pay if she would buy the brown vest
= 8.40 + 4
= $12.40

10% →  12.40
100% → ^12.40₁₀ x 100 = 124

Original price of the brown vest = $124

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

Price of the black vest after discount
= ⁸⁰₁₀₀ x 124
= $99.20

Amount that Nicole had at first
= 99.20 + 4
= $103.20

Answer(s): (a) $124; (b) $103.20