During a bonanza, the discount given by Stall A and Stall B are as shown:
Stall A - Discount of $5 for every $25 spent
Stall B - 25% off Storewide

1. Ivory wants to buy a skirt. The price of the skirt before discount in both shops is $390. What is the savings that Ivory makes if she buys at the shop that sells the same skirt cheaper?
2. Olivia bought a sweater and a shirt from Stall A and paid $180. What was the total cost of the sweater and the shirt before the discount?
3. The price of the same shirt after discount at Stall B is $106.50. Given that the price of the shirt before discount is the same in both stalls, what is the percentage discount given to the shirt at Stall A? Round off the answer to 1 decimal place.

(a)
Amount to pay at Stall A for every $25 spent
= 25 - 5
= $20

Number of sets of $25 in $390
= 390 ÷ 25
= 15 r 15

Discounted price of the skirt at Stall A
= 15 x 20 + 15
= $315

Discounted price of the skirt at Stall B
= 75% x 390 
= ⁷⁵₁₀₀ x 390 
= $292.50

Amount of savings
= 315 - 292.50
= $22.50

(b)
Number of sets of $20 in $180
= 180 ÷ 20
= 9

Total cost of the sweater and the shirt
= 9 x 25
= $225

(c)

	Stall A	Stall B
Original Price	$142	$142
Discount	- $25	- 25%
Discounted Price	$117	$106.50

Original price of the shirt at Stall B before discount
= 106.50 ÷ ⁷⁵₁₀₀
= $142

If the original price of the shirt at Stall A and Stall B is the same, the original price of the shirt at Stall A is $142.

Number of sets of $25 in $142
= 142 ÷ 25
= 5 r 17

Discounted price of the shirt at Stall A
= 5 x 20 + 17
= $117

Discount given for the shirt at Stall A
= 142 - 117
= $25

Percent discount given to the shirt at Stall A
= 100% x ²⁵₁₄₂ 
≈ 17.6%

Answer(s): (a) $22.50; (b) $225; (c) 17.6%