A furniture store was having Lunar New Year discount of 15% off its usual price. The GST is at 3%. Hilda used her credit card to purchase a book shelf and Wesley used cash to pay for a similar book shelf.

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

New book shelf Usual Price: $1400

Further Discount: Pay by credit card: 10% off discounted price before GST! Pay by cash: $45 off discounted price before GST!

	Credit Card	Cash
Usual Price	$1400	$1400
Less 15% discount	- $210.00	- $210.00
Price after 15% discount	$1190.00	$1190.00
Less further discount	- $119.00	- $45
Price after further discount	$1071.00	$1145.00
Price after GST of 3%	$1103.13	$1179.40

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

Price of the book shelf after Lunar New Year discount
= 85% x 1400
= ⁹⁰₁₀₀ x 1400
= $1190.00

New selling price after 10% further discount
= 100% - 10%
= 90%

Price of the book shelf after credit card discount
= 90% x 1190.00
= ⁹⁰₁₀₀ x 1190.00
= $1071.00

Price to pay after including GST
= 100% + 3%
= 103%

Price of the book shelf after GST
= 103% x 1071.00 
= ¹⁰³₁₀₀ x 1071.00 
≈ $1103.13 (Round off to nearest cent)

(b)
Price of the book shelf after cash discount
= 1190.00 - 45
= $1145.00

Price of the book shelf after GST
= 103% x 1145.00 
= ¹⁰³₁₀₀ x 1145.00 
≈ $1179.40 (Round off to nearest ten cent)

Answer(s): (a) $1103.13; (b) $1179.40