The advertisement shows the cost of buying notebooks from a stationery kiosk.
- Mary bought 24 notebooks. How much did she pay?
- Reggie bought 100 notebooks. How much did he pay?
(a)
Number of sets of 15 notebooks
= 24 ÷ 15
= 1 r 9
Cost of first 15 notebooks
= 15 x 3.70
= $55.50
Cost of the next 9 notebooks
= 9 x 3.30
= $29.70
Amount that Mary paid
= 55.50 + 29.70
= $85.20
(b)
Number of notebooks that was not part of the first 15 notebooks
= 100 - 15
= 85
Cost of first 15 notebooks = $55.50
Cost of the next 85 notebooks
= 85 x 3.30
= $280.50
Total cost of 100 notebooks before an additional discount of 8% is applied
= 55.50 + 280.50
= $336
Amount that Reggie paid in percent after an additional discount of 8% is applied
= 100% - 8%
= 92%
100% of the total cost of 100 notebooks = 336
1% of the total cost of 100 notebooks = 336 ÷ 100 = 3.36
92% of the total cost of 100 notebooks = 92 x 3.36 = 309.12
Amount that Reggie paid = $309.12
Answer(s): (a) $85.20; (b) $309.12