The advertisement shows the cost of buying notebooks from a stationery kiosk.
- Xuan bought 18 notebooks. How much did she pay?
- Owen bought 90 notebooks. How much did he pay?
(a)
Number of sets of 15 notebooks
= 18 ÷ 15
= 1 r 3
Cost of first 15 notebooks
= 15 x 3.50
= $52.50
Cost of the next 3 notebooks
= 3 x 3.10
= $9.30
Amount that Xuan paid
= 52.50 + 9.30
= $61.80
(b)
Number of notebooks that was not part of the first 15 notebooks
= 90 - 15
= 75
Cost of first 15 notebooks = $52.50
Cost of the next 75 notebooks
= 75 x 3.10
= $232.50
Total cost of 90 notebooks before an additional discount of 8% is applied
= 52.50 + 232.50
= $285
Amount that Owen paid in percent after an additional discount of 8% is applied
= 100% - 8%
= 92%
100% of the total cost of 90 notebooks = 285
1% of the total cost of 90 notebooks = 285 ÷ 100 = 2.85
92% of the total cost of 90 notebooks = 92 x 2.85 = 262.20
Amount that Owen paid = $262.20
Answer(s): (a) $61.80; (b) $262.20
