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

1. Natalie wants to buy a dress. The price of the dress before discount in both shops is $430. What is the savings that Natalie makes if she buys at the shop that sells the same dress cheaper?
2. Ivory bought a windbreaker and a hoodie from Stall R and paid $140. What was the total cost of the windbreaker and the hoodie before the discount?
3. The price of the same hoodie after discount at Stall S is $112.50. Given that the price of the hoodie before discount is the same in both stalls, what is the percentage discount given to the hoodie at Stall R? Round off the answer to 1 decimal place.

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

Number of sets of $25 in $430
= 430 ÷ 25
= 17 r 5

Discounted price of the dress at Stall R
= 17 x 20 + 5
= $345

Discounted price of the dress at Stall S
= 75% x 430 
= ⁷⁵₁₀₀ x 430 
= $322.50

Amount of savings
= 345 - 322.50
= $22.50

(b)
Number of sets of $20 in $140
= 140 ÷ 20
= 7

Total cost of the windbreaker and the hoodie
= 7 x 25
= $175

(c)

	Stall R	Stall S
Original Price	$150	$150
Discount	- $30	- 25%
Discounted Price	$120	$112.50

Original price of the hoodie at Stall S before discount
= 112.50 ÷ ⁷⁵₁₀₀
= $150

If the original price of the hoodie at Stall R and Stall S is the same, the original price of the hoodie at Stall R is $150.

Number of sets of $25 in $150
= 150 ÷ 25
= 6 r 0

Discounted price of the hoodie at Stall R
= 6 x 20 + 0
= $120

Discount given for the hoodie at Stall R
= 150 - 120
= $30

Percent discount given to the hoodie at Stall R
= 100% x ³⁰₁₅₀ 
≈ 20.0%

Answer(s): (a) $22.50; (b) $175; (c) 20.0%