The advertisement shows the cost of buying staplers from a shop.
- Xandra bought 19 staplers. How much did she pay?
- Charlie bought 60 staplers. How much did he pay?
(a)
Number of sets of 15 staplers
= 19 ÷ 15
= 1 r 4
Cost of first 15 staplers
= 15 x 4.90
= $73.50
Cost of the next 4 staplers
= 4 x 4.70
= $18.80
Amount that Xandra paid
= 73.50 + 18.80
= $92.30
(b)
Number of staplers that was not part of the first 15 staplers
= 60 - 15
= 45
Cost of first 15 staplers = $73.50
Cost of the next 45 staplers
= 45 x 4.70
= $211.50
Total cost of 60 staplers before an additional discount of 5% is applied
= 73.50 + 211.50
= $285
Amount that Charlie paid in percent after an additional discount of 5% is applied
= 100% - 5%
= 95%
100% of the total cost of 60 staplers = 285
1% of the total cost of 60 staplers = 285 ÷ 100 = 2.85
95% of the total cost of 60 staplers = 95 x 2.85 = 270.75
Amount that Charlie paid = $270.75
Answer(s): (a) $92.30; (b) $270.75