A furniture store was having Chinese New Year discount of 20% off its usual price. The GST is at 9%. Julie used her credit card to purchase a kitchen table and Bryan used cash to pay for a similar kitchen table.

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

New kitchen table Usual Price: $700

Further Discount: Pay by credit card: 15% off discounted price before GST! Pay by cash: $65 off discounted price before GST!

	Credit Card	Cash
Usual Price	$700	$700
Less 20% discount	- $140.00	- $140.00
Price after 20% discount	$560.00	$560.00
Less further discount	- $84.00	- $65
Price after further discount	$476.00	$495.00
Price after GST of 9%	$518.84	$539.60

(a)
New selling price after 20% discount
= 100% - 20%
= 80%

Price of the kitchen table after Chinese New Year discount
= 80% x 700
= ⁸⁵₁₀₀ x 700
= $560.00

New selling price after 15% further discount
= 100% - 15%
= 85%

Price of the kitchen table after credit card discount
= 85% x 560.00
= ⁸⁵₁₀₀ x 560.00
= $476.00

Price to pay after including GST
= 100% + 9%
= 109%

Price of the kitchen table after GST
= 109% x 476.00 
= ¹⁰⁹₁₀₀ x 476.00 
≈ $518.84 (Round off to nearest cent)

(b)
Price of the kitchen table after cash discount
= 560.00 - 65
= $495.00

Price of the kitchen table after GST
= 109% x 495.00 
= ¹⁰⁹₁₀₀ x 495.00 
≈ $539.60 (Round off to nearest ten cent)

Answer(s): (a) $518.84; (b) $539.60