The advertisement shows the cost of buying staplers from a bookstore.
- Lucy bought 24 staplers. How much did she pay?
- Bobby bought 50 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 3.10
= $46.50
Cost of the next 9 staplers
= 9 x 2.70
= $24.30
Amount that Lucy paid
= 46.50 + 24.30
= $70.80
(b)
Number of staplers that was not part of the first 15 staplers
= 50 - 15
= 35
Cost of first 15 staplers = $46.50
Cost of the next 35 staplers
= 35 x 2.70
= $94.50
Total cost of 50 staplers before an additional discount of 3% is applied
= 46.50 + 94.50
= $141
Amount that Bobby paid in percent after an additional discount of 3% is applied
= 100% - 3%
= 97%
100% of the total cost of 50 staplers = 141
1% of the total cost of 50 staplers = 141 ÷ 100 = 1.41
97% of the total cost of 50 staplers = 97 x 1.41 = 136.77
Amount that Bobby paid = $136.77
Answer(s): (a) $70.80; (b) $136.77