PSLE
Tina wanted to buy a shirt. She saw a gold shirt on sale at 10% discount and a white shirt at 30% discount. Both shirts had the same original price before the discounts. To buy the gold shirt, Tina would need $9.80 more that what she had. So Tina bought the white shirt. After that, she had $10 left.

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

	Gold shirt	White shirt
Before	100%	100%
Change	- 10%	- 30%
After	90%	70%

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

Additional amount that Tina needed to pay if she would buy the gold shirt
= 9.80 + 10
= $19.80

20% →  19.80
100% → ^19.80₂₀ x 100 = 99

Original price of the gold shirt = $99

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

Price of the white shirt after discount
= ⁷⁰₁₀₀ x 99
= $69.30

Amount that Tina had at first
= 69.30 + 10
= $79.30

Answer(s): (a) $99; (b) $79.30