A furniture store was having Lunar New Year discount of 15% off its usual price. The GST is at 4%. Marion used her credit card to purchase a kitchen table and Caden used cash to pay for a similar kitchen table.

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

New kitchen table Usual Price: $340

Further Discount: Pay by credit card: 15% off discounted price before GST! Pay by cash: $20 off discounted price before GST!

	Credit Card	Cash
Usual Price	$340	$340
Less 15% discount	- $51.00	- $51.00
Price after 15% discount	$289.00	$289.00
Less further discount	- $43.35	- $20
Price after further discount	$245.65	$269.00
Price after GST of 4%	$255.48	$279.80

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

Price of the kitchen table after Lunar New Year discount
= 85% x 340
= ⁸⁵₁₀₀ x 340
= $289.00

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

Price of the kitchen table after credit card discount
= 85% x 289.00
= ⁸⁵₁₀₀ x 289.00
= $245.65

Price to pay after including GST
= 100% + 4%
= 104%

Price of the kitchen table after GST
= 104% x 245.65 
= ¹⁰⁴₁₀₀ x 245.65 
≈ $255.48 (Round off to nearest cent)

(b)
Price of the kitchen table after cash discount
= 289.00 - 20
= $269.00

Price of the kitchen table after GST
= 104% x 269.00 
= ¹⁰⁴₁₀₀ x 269.00 
≈ $279.80 (Round off to nearest ten cent)

Answer(s): (a) $255.48; (b) $279.80