The advertisement shows the cost of buying staplers from a book shop.
- Emily bought 17 staplers. How much did she pay?
- Cole bought 70 staplers. How much did he pay?
(a)
Number of sets of 15 staplers
= 17 ÷ 15
= 1 r 2
Cost of first 15 staplers
= 15 x 3.90
= $58.50
Cost of the next 2 staplers
= 2 x 3.70
= $7.40
Amount that Emily paid
= 58.50 + 7.40
= $65.90
(b)
Number of staplers that was not part of the first 15 staplers
= 70 - 15
= 55
Cost of first 15 staplers = $58.50
Cost of the next 55 staplers
= 55 x 3.70
= $203.50
Total cost of 70 staplers before an additional discount of 5% is applied
= 58.50 + 203.50
= $262
Amount that Cole paid in percent after an additional discount of 5% is applied
= 100% - 5%
= 95%
100% of the total cost of 70 staplers = 262
1% of the total cost of 70 staplers = 262 ÷ 100 = 2.62
95% of the total cost of 70 staplers = 95 x 2.62 = 248.90
Amount that Cole paid = $248.90
Answer(s): (a) $65.90; (b) $248.90