The advertisement shows the cost of buying files from a stationery kiosk.
- Zara bought 27 files. How much did she pay?
- John bought 70 files. How much did he pay?
(a)
Number of sets of 15 files
= 27 ÷ 15
= 1 r 12
Cost of first 15 files
= 15 x 2.10
= $31.50
Cost of the next 12 files
= 12 x 1.90
= $22.80
Amount that Zara paid
= 31.50 + 22.80
= $54.30
(b)
Number of files that was not part of the first 15 files
= 70 - 15
= 55
Cost of first 15 files = $31.50
Cost of the next 55 files
= 55 x 1.90
= $104.50
Total cost of 70 files before an additional discount of 7% is applied
= 31.50 + 104.50
= $136
Amount that John paid in percent after an additional discount of 7% is applied
= 100% - 7%
= 93%
100% of the total cost of 70 files = 136
1% of the total cost of 70 files = 136 ÷ 100 = 1.36
93% of the total cost of 70 files = 93 x 1.36 = 126.48
Amount that John paid = $126.48
Answer(s): (a) $54.30; (b) $126.48