The advertisement shows the cost of buying markers from a stationery shop.
- Xandra bought 29 markers. How much did she pay?
- Julian bought 90 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 2.30
= $34.50
Cost of the next 14 markers
= 14 x 1.90
= $26.60
Amount that Xandra paid
= 34.50 + 26.60
= $61.10
(b)
Number of markers that was not part of the first 15 markers
= 90 - 15
= 75
Cost of first 15 markers = $34.50
Cost of the next 75 markers
= 75 x 1.90
= $142.50
Total cost of 90 markers before an additional discount of 9% is applied
= 34.50 + 142.50
= $177
Amount that Julian paid in percent after an additional discount of 9% is applied
= 100% - 9%
= 91%
100% of the total cost of 90 markers = 177
1% of the total cost of 90 markers = 177 ÷ 100 = 1.77
91% of the total cost of 90 markers = 91 x 1.77 = 161.07
Amount that Julian paid = $161.07
Answer(s): (a) $61.10; (b) $161.07