PSLE
Penelope wanted to buy a skirt. She saw a brown skirt on sale at 10% discount and a black skirt at 30% discount. Both skirts had the same original price before the discounts. To buy the brown skirt, Penelope would need $6.40 more that what she had. So Penelope bought the black skirt. After that, she had $9 left.

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

	Brown skirt	Black skirt
Before	100%	100%
Change	- 10%	- 30%
After	90%	70%

(a)
Difference in the discount between the brown skirt and the black skirt
= 30% - 10%
= 20%

Additional amount that Penelope needed to pay if she would buy the brown skirt
= 6.40 + 9
= $15.40

20% →  15.40
100% → ^15.40₂₀ x 100 = 77

Original price of the brown skirt = $77

(b)
Price of the black skirt after discount in percentage
= 100% - 30%
= 70%

Price of the black skirt after discount
= ⁷⁰₁₀₀ x 77
= $53.90

Amount that Penelope had at first
= 53.90 + 9
= $62.90

Answer(s): (a) $77; (b) $62.90