A furniture store was having Easter discount of 25% off its usual price. The GST is at 7%. Opal used her credit card to purchase a kitchen table and Ben used cash to pay for a similar kitchen table.

1. How much did Opal pay in the end after GST? Round off your answer to the nearest cent.
2. How much did Ben pay in the end after GST? Round off your answer to the nearest ten cent.

New kitchen table Usual Price: $550

Further Discount: Pay by credit card: 5% off discounted price before GST! Pay by cash: $10 off discounted price before GST!

	Credit Card	Cash
Usual Price	$550	$550
Less 25% discount	- $137.50	- $137.50
Price after 25% discount	$412.50	$412.50
Less further discount	- $20.63	- $10
Price after further discount	$391.88	$402.50
Price after GST of 7%	$419.31	$430.70

(a)
New selling price after 25% discount
= 100% - 25%
= 75%

Price of the kitchen table after Easter discount
= 75% x 550
= ⁹⁵₁₀₀ x 550
= $412.50

New selling price after 5% further discount
= 100% - 5%
= 95%

Price of the kitchen table after credit card discount
= 95% x 412.50
= ⁹⁵₁₀₀ x 412.50
= $391.88

Price to pay after including GST
= 100% + 7%
= 107%

Price of the kitchen table after GST
= 107% x 391.88 
= ¹⁰⁷₁₀₀ x 391.88 
≈ $419.31 (Round off to nearest cent)

(b)
Price of the kitchen table after cash discount
= 412.50 - 10
= $402.50

Price of the kitchen table after GST
= 107% x 402.50 
= ¹⁰⁷₁₀₀ x 402.50 
≈ $430.70 (Round off to nearest ten cent)

Answer(s): (a) $419.31; (b) $430.70