The advertisement shows the cost of buying staplers from a store.
- Erika bought 24 staplers. How much did she pay?
- Warren bought 70 staplers. How much did he pay?
(a)
Number of sets of 15 staplers
= 24 ÷ 15
= 1 r 9
Cost of first 15 staplers
= 15 x 3.30
= $49.50
Cost of the next 9 staplers
= 9 x 2.90
= $26.10
Amount that Erika paid
= 49.50 + 26.10
= $75.60
(b)
Number of staplers that was not part of the first 15 staplers
= 70 - 15
= 55
Cost of first 15 staplers = $49.50
Cost of the next 55 staplers
= 55 x 2.90
= $159.50
Total cost of 70 staplers before an additional discount of 9% is applied
= 49.50 + 159.50
= $209
Amount that Warren paid in percent after an additional discount of 9% is applied
= 100% - 9%
= 91%
100% of the total cost of 70 staplers = 209
1% of the total cost of 70 staplers = 209 ÷ 100 = 2.09
91% of the total cost of 70 staplers = 91 x 2.09 = 190.19
Amount that Warren paid = $190.19
Answer(s): (a) $75.60; (b) $190.19
