PSLE
Kathy wanted to buy a coat. She saw a gold coat on sale at 15% discount and a green coat at 30% discount. Both coats had the same original price before the discounts. To buy the gold coat, Kathy would need $6.90 more that what she had. So Kathy bought the green coat. After that, she had $18 left.

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

	Gold coat	Green coat
Before	100%	100%
Change	- 15%	- 30%
After	85%	70%

(a)
Difference in the discount between the gold coat and the green coat
= 30% - 15%
= 15%

Additional amount that Kathy needed to pay if she would buy the gold coat
= 6.90 + 18
= $24.90

15% →  24.90
100% → ^24.90₁₅ x 100 = 166

Original price of the gold coat = $166

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

Price of the green coat after discount
= ⁷⁰₁₀₀ x 166
= $116.20

Amount that Kathy had at first
= 116.20 + 18
= $134.20

Answer(s): (a) $166; (b) $134.20