The advertisement shows the cost of buying staplers from a shop.
- Gwen bought 26 staplers. How much did she pay?
- Warren bought 80 staplers. How much did he pay?
(a)
Number of sets of 15 staplers
= 26 ÷ 15
= 1 r 11
Cost of first 15 staplers
= 15 x 4.10
= $61.50
Cost of the next 11 staplers
= 11 x 3.90
= $42.90
Amount that Gwen paid
= 61.50 + 42.90
= $104.40
(b)
Number of staplers that was not part of the first 15 staplers
= 80 - 15
= 65
Cost of first 15 staplers = $61.50
Cost of the next 65 staplers
= 65 x 3.90
= $253.50
Total cost of 80 staplers before an additional discount of 9% is applied
= 61.50 + 253.50
= $315
Amount that Warren paid in percent after an additional discount of 9% is applied
= 100% - 9%
= 91%
100% of the total cost of 80 staplers = 315
1% of the total cost of 80 staplers = 315 ÷ 100 = 3.15
91% of the total cost of 80 staplers = 91 x 3.15 = 286.65
Amount that Warren paid = $286.65
Answer(s): (a) $104.40; (b) $286.65
