The advertisement shows the cost of buying staplers from a book shop.
- Jade bought 28 staplers. How much did she pay?
- Paul bought 70 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 2.70
= $40.50
Cost of the next 13 staplers
= 13 x 2.30
= $29.90
Amount that Jade paid
= 40.50 + 29.90
= $70.40
(b)
Number of staplers that was not part of the first 15 staplers
= 70 - 15
= 55
Cost of first 15 staplers = $40.50
Cost of the next 55 staplers
= 55 x 2.30
= $126.50
Total cost of 70 staplers before an additional discount of 10% is applied
= 40.50 + 126.50
= $167
Amount that Paul paid in percent after an additional discount of 10% is applied
= 100% - 10%
= 90%
100% of the total cost of 70 staplers = 167
1% of the total cost of 70 staplers = 167 ÷ 100 = 1.67
90% of the total cost of 70 staplers = 90 x 1.67 = 150.30
Amount that Paul paid = $150.30
Answer(s): (a) $70.40; (b) $150.30