Kimberly bought one hi-fi system at 30% discount off its original price. She paid a total of $756 for it, which was inclusive of 8% GST on the discounted price. What was the original price of the hi-fi system?
|
Percent expressed as units |
Percent expressed as % |
Amount |
Original price |
100 u |
|
? |
Discount |
- 30 u |
|
|
Discounted price |
70 u |
100% |
$700 |
GST |
|
+ 8% |
|
Amount to pay |
|
108% |
$756 |
Price of the hi-fi system with 8% GST in percent
= 100% + 8%
= 108%
108% of the hi-fi system with 8% GST = 756
1% of the hi-fi system with 8% GST = 756 ÷ 108 = 7
100% of the hi-fi system with 8% GST = 100 x 7 = 700
Price of the hi-fi system at 30% discount in units
= 100 u - 30 u
= 70 u
Discounted price = 100% of the price to pay for before adding GST.
70 u of the hi-fi system without GST = 700
1 u of the hi-fi system without GST = 700 ÷ 70 = 10
100 u of the hi-fi system without GST = 100 x 10 = 1000
Original price of the hi-fi system = $1000
Answer(s): $1000