During a promotion, the discount given by Stall A and Stall B are as shown:
Stall A - Discount of $6 for every $30 spent
Stall B - 25% off Storewide

1. Kathy wants to buy a skirt. The price of the skirt before discount in both shops is $210. What is the savings that Kathy makes if she buys at the shop that sells the same skirt cheaper?
2. Shiyun bought a shirt and a cardigan from Stall A and paid $144. What was the total cost of the shirt and the cardigan before the discount?
3. The price of the same cardigan after discount at Stall B is $100.50. Given that the price of the cardigan before discount is the same in both stalls, what is the percentage discount given to the cardigan at Stall A? Round off the answer to 1 decimal place.

(a)
Amount to pay at Stall A for every $30 spent
= 30 - 6
= $24

Number of sets of $30 in $210
= 210 ÷ 30
= 7 r 0

Discounted price of the skirt at Stall A
= 7 x 24 + 0
= $168

Discounted price of the skirt at Stall B
= 75% x 210 
= ⁷⁵₁₀₀ x 210 
= $157.50

Amount of savings
= 168 - 157.50
= $10.50

(b)
Number of sets of $24 in $144
= 144 ÷ 24
= 6

Total cost of the shirt and the cardigan
= 6 x 30
= $180

(c)

	Stall A	Stall B
Original Price	$134	$134
Discount	- $24	- 25%
Discounted Price	$110	$100.50

Original price of the cardigan at Stall B before discount
= 100.50 ÷ ⁷⁵₁₀₀
= $134

If the original price of the cardigan at Stall A and Stall B is the same, the original price of the cardigan at Stall A is $134.

Number of sets of $30 in $134
= 134 ÷ 30
= 4 r 14

Discounted price of the cardigan at Stall A
= 4 x 24 + 14
= $110

Discount given for the cardigan at Stall A
= 134 - 110
= $24

Percent discount given to the cardigan at Stall A
= 100% x ²⁴₁₃₄ 
≈ 17.9%

Answer(s): (a) $10.50; (b) $180; (c) 17.9%