The advertisement shows the cost of buying notebooks from a store.
- Gwen bought 26 notebooks. How much did she pay?
- Paul bought 70 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 4.90
= $73.50
Cost of the next 11 notebooks
= 11 x 4.70
= $51.70
Amount that Gwen paid
= 73.50 + 51.70
= $125.20
(b)
Number of notebooks that was not part of the first 15 notebooks
= 70 - 15
= 55
Cost of first 15 notebooks = $73.50
Cost of the next 55 notebooks
= 55 x 4.70
= $258.50
Total cost of 70 notebooks before an additional discount of 3% is applied
= 73.50 + 258.50
= $332
Amount that Paul paid in percent after an additional discount of 3% is applied
= 100% - 3%
= 97%
100% of the total cost of 70 notebooks = 332
1% of the total cost of 70 notebooks = 332 ÷ 100 = 3.32
97% of the total cost of 70 notebooks = 97 x 3.32 = 322.04
Amount that Paul paid = $322.04
Answer(s): (a) $125.20; (b) $322.04