The advertisement shows the cost of buying staplers from a store.
- Esther bought 23 staplers. How much did she pay?
- Ethan bought 90 staplers. How much did he pay?
(a)
Number of sets of 15 staplers
= 23 ÷ 15
= 1 r 8
Cost of first 15 staplers
= 15 x 3.10
= $46.50
Cost of the next 8 staplers
= 8 x 2.70
= $21.60
Amount that Esther paid
= 46.50 + 21.60
= $68.10
(b)
Number of staplers that was not part of the first 15 staplers
= 90 - 15
= 75
Cost of first 15 staplers = $46.50
Cost of the next 75 staplers
= 75 x 2.70
= $202.50
Total cost of 90 staplers before an additional discount of 10% is applied
= 46.50 + 202.50
= $249
Amount that Ethan paid in percent after an additional discount of 10% is applied
= 100% - 10%
= 90%
100% of the total cost of 90 staplers = 249
1% of the total cost of 90 staplers = 249 ÷ 100 = 2.49
90% of the total cost of 90 staplers = 90 x 2.49 = 224.10
Amount that Ethan paid = $224.10
Answer(s): (a) $68.10; (b) $224.10
