The advertisement shows the cost of buying files from a stationery shop.
- Julie bought 27 files. How much did she pay?
- Howard bought 100 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 4.10
= $61.50
Cost of the next 12 files
= 12 x 3.70
= $44.40
Amount that Julie paid
= 61.50 + 44.40
= $105.90
(b)
Number of files that was not part of the first 15 files
= 100 - 15
= 85
Cost of first 15 files = $61.50
Cost of the next 85 files
= 85 x 3.70
= $314.50
Total cost of 100 files before an additional discount of 8% is applied
= 61.50 + 314.50
= $376
Amount that Howard paid in percent after an additional discount of 8% is applied
= 100% - 8%
= 92%
100% of the total cost of 100 files = 376
1% of the total cost of 100 files = 376 ÷ 100 = 3.76
92% of the total cost of 100 files = 92 x 3.76 = 345.92
Amount that Howard paid = $345.92
Answer(s): (a) $105.90; (b) $345.92
