PSLE
Zara wanted to buy a vest. She saw a silver vest on sale at 10% discount and a grey vest at 20% discount. Both vests had the same original price before the discounts. To buy the silver vest, Zara would need $8.40 more that what she had. So Zara bought the grey vest. After that, she had $11 left.

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

	Silver vest	Grey vest
Before	100%	100%
Change	- 10%	- 20%
After	90%	80%

(a)
Difference in the discount between the silver vest and the grey vest
= 20% - 10%
= 10%

Additional amount that Zara needed to pay if she would buy the silver vest
= 8.40 + 11
= $19.40

10% →  19.40
100% → ^19.40₁₀ x 100 = 194

Original price of the silver vest = $194

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

Price of the grey vest after discount
= ⁸⁰₁₀₀ x 194
= $155.20

Amount that Zara had at first
= 155.20 + 11
= $166.20

Answer(s): (a) $194; (b) $166.20