The advertisement shows the cost of buying staplers from a bookstore.
- Opal bought 19 staplers. How much did she pay?
- Gabriel 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 2.10
= $31.50
Cost of the next 4 staplers
= 4 x 1.70
= $6.80
Amount that Opal paid
= 31.50 + 6.80
= $38.30
(b)
Number of staplers that was not part of the first 15 staplers
= 60 - 15
= 45
Cost of first 15 staplers = $31.50
Cost of the next 45 staplers
= 45 x 1.70
= $76.50
Total cost of 60 staplers before an additional discount of 4% is applied
= 31.50 + 76.50
= $108
Amount that Gabriel paid in percent after an additional discount of 4% is applied
= 100% - 4%
= 96%
100% of the total cost of 60 staplers = 108
1% of the total cost of 60 staplers = 108 ÷ 100 = 1.08
96% of the total cost of 60 staplers = 96 x 1.08 = 103.68
Amount that Gabriel paid = $103.68
Answer(s): (a) $38.30; (b) $103.68
