The advertisement shows the cost of buying staplers from a stationery kiosk.
- Olivia bought 28 staplers. How much did she pay?
- Vincent bought 50 staplers. How much did he pay?
(a)
Number of sets of 15 staplers
= 28 ÷ 15
= 1 r 13
Cost of first 15 staplers
= 15 x 1.50
= $22.50
Cost of the next 13 staplers
= 13 x 1.30
= $16.90
Amount that Olivia paid
= 22.50 + 16.90
= $39.40
(b)
Number of staplers that was not part of the first 15 staplers
= 50 - 15
= 35
Cost of first 15 staplers = $22.50
Cost of the next 35 staplers
= 35 x 1.30
= $45.50
Total cost of 50 staplers before an additional discount of 3% is applied
= 22.50 + 45.50
= $68
Amount that Vincent paid in percent after an additional discount of 3% is applied
= 100% - 3%
= 97%
100% of the total cost of 50 staplers = 68
1% of the total cost of 50 staplers = 68 ÷ 100 = 0.68
97% of the total cost of 50 staplers = 97 x 0.68 = 65.96
Amount that Vincent paid = $65.96
Answer(s): (a) $39.40; (b) $65.96