The advertisement shows the cost of buying markers from a shop.
- Natalie bought 18 markers. How much did she pay?
- Wesley bought 100 markers. How much did he pay?
(a)
Number of sets of 15 markers
= 18 ÷ 15
= 1 r 3
Cost of first 15 markers
= 15 x 2.10
= $31.50
Cost of the next 3 markers
= 3 x 1.90
= $5.70
Amount that Natalie paid
= 31.50 + 5.70
= $37.20
(b)
Number of markers that was not part of the first 15 markers
= 100 - 15
= 85
Cost of first 15 markers = $31.50
Cost of the next 85 markers
= 85 x 1.90
= $161.50
Total cost of 100 markers before an additional discount of 8% is applied
= 31.50 + 161.50
= $193
Amount that Wesley paid in percent after an additional discount of 8% is applied
= 100% - 8%
= 92%
100% of the total cost of 100 markers = 193
1% of the total cost of 100 markers = 193 ÷ 100 = 1.93
92% of the total cost of 100 markers = 92 x 1.93 = 177.56
Amount that Wesley paid = $177.56
Answer(s): (a) $37.20; (b) $177.56