The advertisement shows the cost of buying notebooks from a bookstore.
- Cathy bought 26 notebooks. How much did she pay?
- Fred bought 100 notebooks. How much did he pay?
(a)
Number of sets of 15 notebooks
= 26 ÷ 15
= 1 r 11
Cost of first 15 notebooks
= 15 x 3.30
= $49.50
Cost of the next 11 notebooks
= 11 x 2.90
= $31.90
Amount that Cathy paid
= 49.50 + 31.90
= $81.40
(b)
Number of notebooks that was not part of the first 15 notebooks
= 100 - 15
= 85
Cost of first 15 notebooks = $49.50
Cost of the next 85 notebooks
= 85 x 2.90
= $246.50
Total cost of 100 notebooks before an additional discount of 7% is applied
= 49.50 + 246.50
= $296
Amount that Fred paid in percent after an additional discount of 7% is applied
= 100% - 7%
= 93%
100% of the total cost of 100 notebooks = 296
1% of the total cost of 100 notebooks = 296 ÷ 100 = 2.96
93% of the total cost of 100 notebooks = 93 x 2.96 = 275.28
Amount that Fred paid = $275.28
Answer(s): (a) $81.40; (b) $275.28