A furniture store was having Valentine's Day discount of 15% off its usual price. The GST is at 7%. Tiffany used her credit card to purchase a kitchen table and Dylan used cash to pay for a similar kitchen table.

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

New kitchen table Usual Price: $840

Further Discount: Pay by credit card: 5% off discounted price before GST! Pay by cash: $60 off discounted price before GST!

	Credit Card	Cash
Usual Price	$840	$840
Less 15% discount	- $126.00	- $126.00
Price after 15% discount	$714.00	$714.00
Less further discount	- $35.70	- $60
Price after further discount	$678.30	$654.00
Price after GST of 7%	$725.78	$699.80

(a)
New selling price after 15% discount
= 100% - 15%
= 85%

Price of the kitchen table after Valentine's Day discount
= 85% x 840
= ⁹⁵₁₀₀ x 840
= $714.00

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

Price of the kitchen table after credit card discount
= 95% x 714.00
= ⁹⁵₁₀₀ x 714.00
= $678.30

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

Price of the kitchen table after GST
= 107% x 678.30 
= ¹⁰⁷₁₀₀ x 678.30 
≈ $725.78 (Round off to nearest cent)

(b)
Price of the kitchen table after cash discount
= 714.00 - 60
= $654.00

Price of the kitchen table after GST
= 107% x 654.00 
= ¹⁰⁷₁₀₀ x 654.00 
≈ $699.80 (Round off to nearest ten cent)

Answer(s): (a) $725.78; (b) $699.80