The advertisement shows the cost of buying files from a stationery kiosk.
- Shiyun bought 17 files. How much did she pay?
- Xavier bought 80 files. How much did he pay?
(a)
Number of sets of 15 files
= 17 ÷ 15
= 1 r 2
Cost of first 15 files
= 15 x 4.90
= $73.50
Cost of the next 2 files
= 2 x 4.70
= $9.40
Amount that Shiyun paid
= 73.50 + 9.40
= $82.90
(b)
Number of files that was not part of the first 15 files
= 80 - 15
= 65
Cost of first 15 files = $73.50
Cost of the next 65 files
= 65 x 4.70
= $305.50
Total cost of 80 files before an additional discount of 8% is applied
= 73.50 + 305.50
= $379
Amount that Xavier paid in percent after an additional discount of 8% is applied
= 100% - 8%
= 92%
100% of the total cost of 80 files = 379
1% of the total cost of 80 files = 379 ÷ 100 = 3.79
92% of the total cost of 80 files = 92 x 3.79 = 348.68
Amount that Xavier paid = $348.68
Answer(s): (a) $82.90; (b) $348.68
