PSLE
Kathy wanted to buy a coat. She saw a black coat on sale at 25% discount and a blue coat at 40% discount. Both coats had the same original price before the discounts. To buy the black coat, Kathy would need $6.80 more that what she had. So Kathy bought the blue coat. After that, she had $10 left.

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

	Black coat	Blue coat
Before	100%	100%
Change	- 25%	- 40%
After	75%	60%

(a)
Difference in the discount between the black coat and the blue coat
= 40% - 25%
= 15%

Additional amount that Kathy needed to pay if she would buy the black coat
= 6.80 + 10
= $16.80

15% →  16.80
100% → ^16.80₁₅ x 100 = 112

Original price of the black coat = $112

(b)
Price of the blue coat after discount in percentage
= 100% - 40%
= 60%

Price of the blue coat after discount
= ⁶⁰₁₀₀ x 112
= $67.20

Amount that Kathy had at first
= 67.20 + 10
= $77.20

Answer(s): (a) $112; (b) $77.20