The advertisement shows the cost of buying notebooks from a shop.
- Shannon bought 27 notebooks. How much did she pay?
- Cody bought 50 notebooks. How much did he pay?
(a)
Number of sets of 15 notebooks
= 27 ÷ 15
= 1 r 12
Cost of first 15 notebooks
= 15 x 2.90
= $43.50
Cost of the next 12 notebooks
= 12 x 2.70
= $32.40
Amount that Shannon paid
= 43.50 + 32.40
= $75.90
(b)
Number of notebooks that was not part of the first 15 notebooks
= 50 - 15
= 35
Cost of first 15 notebooks = $43.50
Cost of the next 35 notebooks
= 35 x 2.70
= $94.50
Total cost of 50 notebooks before an additional discount of 10% is applied
= 43.50 + 94.50
= $138
Amount that Cody paid in percent after an additional discount of 10% is applied
= 100% - 10%
= 90%
100% of the total cost of 50 notebooks = 138
1% of the total cost of 50 notebooks = 138 ÷ 100 = 1.38
90% of the total cost of 50 notebooks = 90 x 1.38 = 124.20
Amount that Cody paid = $124.20
Answer(s): (a) $75.90; (b) $124.20