A furniture store was having Mid Year discount of 20% off its usual price. The GST is at 9%. Elyse used her credit card to purchase a study table and Bobby used cash to pay for a similar study table.

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

New study table Usual Price: $1400

Further Discount: Pay by credit card: 10% off discounted price before GST! Pay by cash: $60 off discounted price before GST!

	Credit Card	Cash
Usual Price	$1400	$1400
Less 20% discount	- $280.00	- $280.00
Price after 20% discount	$1120.00	$1120.00
Less further discount	- $112.00	- $60
Price after further discount	$1008.00	$1060.00
Price after GST of 9%	$1098.72	$1155.40

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

Price of the study table after Mid Year discount
= 80% x 1400
= ⁹⁰₁₀₀ x 1400
= $1120.00

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

Price of the study table after credit card discount
= 90% x 1120.00
= ⁹⁰₁₀₀ x 1120.00
= $1008.00

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

Price of the study table after GST
= 109% x 1008.00 
= ¹⁰⁹₁₀₀ x 1008.00 
≈ $1098.72 (Round off to nearest cent)

(b)
Price of the study table after cash discount
= 1120.00 - 60
= $1060.00

Price of the study table after GST
= 109% x 1060.00 
= ¹⁰⁹₁₀₀ x 1060.00 
≈ $1155.40 (Round off to nearest ten cent)

Answer(s): (a) $1098.72; (b) $1155.40