The advertisement shows the cost of buying notebooks from a stationery shop.
- Gabby bought 17 notebooks. How much did she pay?
- Oscar bought 80 notebooks. How much did he pay?
(a)
Number of sets of 15 notebooks
= 17 ÷ 15
= 1 r 2
Cost of first 15 notebooks
= 15 x 3.50
= $52.50
Cost of the next 2 notebooks
= 2 x 3.30
= $6.60
Amount that Gabby paid
= 52.50 + 6.60
= $59.10
(b)
Number of notebooks that was not part of the first 15 notebooks
= 80 - 15
= 65
Cost of first 15 notebooks = $52.50
Cost of the next 65 notebooks
= 65 x 3.30
= $214.50
Total cost of 80 notebooks before an additional discount of 7% is applied
= 52.50 + 214.50
= $267
Amount that Oscar paid in percent after an additional discount of 7% is applied
= 100% - 7%
= 93%
100% of the total cost of 80 notebooks = 267
1% of the total cost of 80 notebooks = 267 ÷ 100 = 2.67
93% of the total cost of 80 notebooks = 93 x 2.67 = 248.31
Amount that Oscar paid = $248.31
Answer(s): (a) $59.10; (b) $248.31
