The advertisement shows the cost of buying files from a stationery kiosk.
- Diana bought 23 files. How much did she pay?
- Harry bought 70 files. How much did he pay?
(a)
Number of sets of 15 files
= 23 ÷ 15
= 1 r 8
Cost of first 15 files
= 15 x 1.50
= $22.50
Cost of the next 8 files
= 8 x 1.30
= $10.40
Amount that Diana paid
= 22.50 + 10.40
= $32.90
(b)
Number of files that was not part of the first 15 files
= 70 - 15
= 55
Cost of first 15 files = $22.50
Cost of the next 55 files
= 55 x 1.30
= $71.50
Total cost of 70 files before an additional discount of 8% is applied
= 22.50 + 71.50
= $94
Amount that Harry paid in percent after an additional discount of 8% is applied
= 100% - 8%
= 92%
100% of the total cost of 70 files = 94
1% of the total cost of 70 files = 94 ÷ 100 = 0.94
92% of the total cost of 70 files = 92 x 0.94 = 86.48
Amount that Harry paid = $86.48
Answer(s): (a) $32.90; (b) $86.48
