The advertisement shows the cost of buying markers from a book shop.
- Roshel bought 23 markers. How much did she pay?
- Ethan bought 80 markers. How much did he pay?
(a)
Number of sets of 15 markers
= 23 ÷ 15
= 1 r 8
Cost of first 15 markers
= 15 x 2.30
= $34.50
Cost of the next 8 markers
= 8 x 1.90
= $15.20
Amount that Roshel paid
= 34.50 + 15.20
= $49.70
(b)
Number of markers that was not part of the first 15 markers
= 80 - 15
= 65
Cost of first 15 markers = $34.50
Cost of the next 65 markers
= 65 x 1.90
= $123.50
Total cost of 80 markers before an additional discount of 3% is applied
= 34.50 + 123.50
= $158
Amount that Ethan paid in percent after an additional discount of 3% is applied
= 100% - 3%
= 97%
100% of the total cost of 80 markers = 158
1% of the total cost of 80 markers = 158 ÷ 100 = 1.58
97% of the total cost of 80 markers = 97 x 1.58 = 153.26
Amount that Ethan paid = $153.26
Answer(s): (a) $49.70; (b) $153.26