The advertisement shows the cost of buying markers from a stationery shop.
- Vanessa bought 29 markers. How much did she pay?
- Oliver bought 80 markers. How much did he pay?
(a)
Number of sets of 15 markers
= 29 ÷ 15
= 1 r 14
Cost of first 15 markers
= 15 x 4.10
= $61.50
Cost of the next 14 markers
= 14 x 3.90
= $54.60
Amount that Vanessa paid
= 61.50 + 54.60
= $116.10
(b)
Number of markers that was not part of the first 15 markers
= 80 - 15
= 65
Cost of first 15 markers = $61.50
Cost of the next 65 markers
= 65 x 3.90
= $253.50
Total cost of 80 markers before an additional discount of 9% is applied
= 61.50 + 253.50
= $315
Amount that Oliver paid in percent after an additional discount of 9% is applied
= 100% - 9%
= 91%
100% of the total cost of 80 markers = 315
1% of the total cost of 80 markers = 315 ÷ 100 = 3.15
91% of the total cost of 80 markers = 91 x 3.15 = 286.65
Amount that Oliver paid = $286.65
Answer(s): (a) $116.10; (b) $286.65