The advertisement shows the cost of buying staplers from a stationery shop.
- Irene bought 22 staplers. How much did she pay?
- Jeremy bought 70 staplers. How much did he pay?
(a)
Number of sets of 15 staplers
= 22 ÷ 15
= 1 r 7
Cost of first 15 staplers
= 15 x 3.50
= $52.50
Cost of the next 7 staplers
= 7 x 3.10
= $21.70
Amount that Irene paid
= 52.50 + 21.70
= $74.20
(b)
Number of staplers that was not part of the first 15 staplers
= 70 - 15
= 55
Cost of first 15 staplers = $52.50
Cost of the next 55 staplers
= 55 x 3.10
= $170.50
Total cost of 70 staplers before an additional discount of 10% is applied
= 52.50 + 170.50
= $223
Amount that Jeremy paid in percent after an additional discount of 10% is applied
= 100% - 10%
= 90%
100% of the total cost of 70 staplers = 223
1% of the total cost of 70 staplers = 223 ÷ 100 = 2.23
90% of the total cost of 70 staplers = 90 x 2.23 = 200.70
Amount that Jeremy paid = $200.70
Answer(s): (a) $74.20; (b) $200.70