The advertisement shows the cost of buying notebooks from a stationery kiosk.
- Victoria bought 29 notebooks. How much did she pay?
- Tom bought 70 notebooks. How much did he pay?
(a)
Number of sets of 15 notebooks
= 29 ÷ 15
= 1 r 14
Cost of first 15 notebooks
= 15 x 2.50
= $37.50
Cost of the next 14 notebooks
= 14 x 2.10
= $29.40
Amount that Victoria paid
= 37.50 + 29.40
= $66.90
(b)
Number of notebooks that was not part of the first 15 notebooks
= 70 - 15
= 55
Cost of first 15 notebooks = $37.50
Cost of the next 55 notebooks
= 55 x 2.10
= $115.50
Total cost of 70 notebooks before an additional discount of 9% is applied
= 37.50 + 115.50
= $153
Amount that Tom paid in percent after an additional discount of 9% is applied
= 100% - 9%
= 91%
100% of the total cost of 70 notebooks = 153
1% of the total cost of 70 notebooks = 153 ÷ 100 = 1.53
91% of the total cost of 70 notebooks = 91 x 1.53 = 139.23
Amount that Tom paid = $139.23
Answer(s): (a) $66.90; (b) $139.23
