PSLE
Mary wanted to buy a skirt. She saw a white skirt on sale at 10% discount and a brown skirt at 20% discount. Both skirts had the same original price before the discounts. To buy the white skirt, Mary would need $8.80 more that what she had. So Mary bought the brown skirt. After that, she had $10 left.

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

	White skirt	Brown skirt
Before	100%	100%
Change	- 10%	- 20%
After	90%	80%

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

Additional amount that Mary needed to pay if she would buy the white skirt
= 8.80 + 10
= $18.80

10% →  18.80
100% → ^18.80₁₀ x 100 = 188

Original price of the white skirt = $188

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

Price of the brown skirt after discount
= ⁸⁰₁₀₀ x 188
= $150.40

Amount that Mary had at first
= 150.40 + 10
= $160.40

Answer(s): (a) $188; (b) $160.40