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

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

New kitchen table Usual Price: $960

Further Discount: Pay by credit card: 15% off discounted price before GST! Pay by cash: $75 off discounted price before GST!

	Credit Card	Cash
Usual Price	$960	$960
Less 25% discount	- $240.00	- $240.00
Price after 25% discount	$720.00	$720.00
Less further discount	- $108.00	- $75
Price after further discount	$612.00	$645.00
Price after GST of 7%	$654.84	$690.20

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

Price of the kitchen table after National Day discount
= 75% x 960
= ⁸⁵₁₀₀ x 960
= $720.00

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

Price of the kitchen table after credit card discount
= 85% x 720.00
= ⁸⁵₁₀₀ x 720.00
= $612.00

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

Price of the kitchen table after GST
= 107% x 612.00 
= ¹⁰⁷₁₀₀ x 612.00 
≈ $654.84 (Round off to nearest cent)

(b)
Price of the kitchen table after cash discount
= 720.00 - 75
= $645.00

Price of the kitchen table after GST
= 107% x 645.00 
= ¹⁰⁷₁₀₀ x 645.00 
≈ $690.20 (Round off to nearest ten cent)

Answer(s): (a) $654.84; (b) $690.20