The advertisement shows the cost of buying staplers from a bookstore.
- Cathy bought 27 staplers. How much did she pay?
- Bobby bought 100 staplers. How much did he pay?
(a)
Number of sets of 15 staplers
= 27 ÷ 15
= 1 r 12
Cost of first 15 staplers
= 15 x 3.30
= $49.50
Cost of the next 12 staplers
= 12 x 2.90
= $34.80
Amount that Cathy paid
= 49.50 + 34.80
= $84.30
(b)
Number of staplers that was not part of the first 15 staplers
= 100 - 15
= 85
Cost of first 15 staplers = $49.50
Cost of the next 85 staplers
= 85 x 2.90
= $246.50
Total cost of 100 staplers before an additional discount of 6% is applied
= 49.50 + 246.50
= $296
Amount that Bobby paid in percent after an additional discount of 6% is applied
= 100% - 6%
= 94%
100% of the total cost of 100 staplers = 296
1% of the total cost of 100 staplers = 296 ÷ 100 = 2.96
94% of the total cost of 100 staplers = 94 x 2.96 = 278.24
Amount that Bobby paid = $278.24
Answer(s): (a) $84.30; (b) $278.24