The advertisement shows the cost of buying markers from a book shop.
- Tammy bought 18 markers. How much did she pay?
- Jeremy bought 90 markers. How much did he pay?
(a)
Number of sets of 15 markers
= 18 ÷ 15
= 1 r 3
Cost of first 15 markers
= 15 x 4.10
= $61.50
Cost of the next 3 markers
= 3 x 3.90
= $11.70
Amount that Tammy paid
= 61.50 + 11.70
= $73.20
(b)
Number of markers that was not part of the first 15 markers
= 90 - 15
= 75
Cost of first 15 markers = $61.50
Cost of the next 75 markers
= 75 x 3.90
= $292.50
Total cost of 90 markers before an additional discount of 7% is applied
= 61.50 + 292.50
= $354
Amount that Jeremy paid in percent after an additional discount of 7% is applied
= 100% - 7%
= 93%
100% of the total cost of 90 markers = 354
1% of the total cost of 90 markers = 354 ÷ 100 = 3.54
93% of the total cost of 90 markers = 93 x 3.54 = 329.22
Amount that Jeremy paid = $329.22
Answer(s): (a) $73.20; (b) $329.22
