The advertisement shows the cost of buying files from a stationery kiosk.
- Sabrina bought 29 files. How much did she pay?
- Ryan bought 60 files. How much did he pay?
(a)
Number of sets of 15 files
= 29 ÷ 15
= 1 r 14
Cost of first 15 files
= 15 x 1.90
= $28.50
Cost of the next 14 files
= 14 x 1.70
= $23.80
Amount that Sabrina paid
= 28.50 + 23.80
= $52.30
(b)
Number of files that was not part of the first 15 files
= 60 - 15
= 45
Cost of first 15 files = $28.50
Cost of the next 45 files
= 45 x 1.70
= $76.50
Total cost of 60 files before an additional discount of 4% is applied
= 28.50 + 76.50
= $105
Amount that Ryan paid in percent after an additional discount of 4% is applied
= 100% - 4%
= 96%
100% of the total cost of 60 files = 105
1% of the total cost of 60 files = 105 ÷ 100 = 1.05
96% of the total cost of 60 files = 96 x 1.05 = 100.80
Amount that Ryan paid = $100.80
Answer(s): (a) $52.30; (b) $100.80
