PSLE
Opal wanted to buy a shirt. She saw a black shirt on sale at 20% discount and a brown shirt at 30% discount. Both shirts had the same original price before the discounts. To buy the black shirt, Opal would need $7.50 more that what she had. So Opal bought the brown shirt. After that, she had $19 left.

1. What was the original price of the black shirt?
2. How much money did Opal have at first?

	Black shirt	Brown shirt
Before	100%	100%
Change	- 20%	- 30%
After	80%	70%

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

Additional amount that Opal needed to pay if she would buy the black shirt
= 7.50 + 19
= $26.50

10% →  26.50
100% → ^26.50₁₀ x 100 = 265

Original price of the black shirt = $265

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

Price of the brown shirt after discount
= ⁷⁰₁₀₀ x 265
= $185.50

Amount that Opal had at first
= 185.50 + 19
= $204.50

Answer(s): (a) $265; (b) $204.50