The advertisement shows the cost of buying markers from a book shop.
- Shannon bought 22 markers. How much did she pay?
- David bought 80 markers. How much did he pay?
(a)
Number of sets of 15 markers
= 22 ÷ 15
= 1 r 7
Cost of first 15 markers
= 15 x 3.70
= $55.50
Cost of the next 7 markers
= 7 x 3.30
= $23.10
Amount that Shannon paid
= 55.50 + 23.10
= $78.60
(b)
Number of markers that was not part of the first 15 markers
= 80 - 15
= 65
Cost of first 15 markers = $55.50
Cost of the next 65 markers
= 65 x 3.30
= $214.50
Total cost of 80 markers before an additional discount of 5% is applied
= 55.50 + 214.50
= $270
Amount that David paid in percent after an additional discount of 5% is applied
= 100% - 5%
= 95%
100% of the total cost of 80 markers = 270
1% of the total cost of 80 markers = 270 ÷ 100 = 2.7
95% of the total cost of 80 markers = 95 x 2.7 = 256.50
Amount that David paid = $256.50
Answer(s): (a) $78.60; (b) $256.50
