The advertisement shows the cost of buying staplers from a book shop.
- Esther bought 28 staplers. How much did she pay?
- Cole bought 80 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 Esther paid
= 22.50 + 16.90
= $39.40
(b)
Number of staplers that was not part of the first 15 staplers
= 80 - 15
= 65
Cost of first 15 staplers = $22.50
Cost of the next 65 staplers
= 65 x 1.30
= $84.50
Total cost of 80 staplers before an additional discount of 6% is applied
= 22.50 + 84.50
= $107
Amount that Cole paid in percent after an additional discount of 6% is applied
= 100% - 6%
= 94%
100% of the total cost of 80 staplers = 107
1% of the total cost of 80 staplers = 107 ÷ 100 = 1.07
94% of the total cost of 80 staplers = 94 x 1.07 = 100.58
Amount that Cole paid = $100.58
Answer(s): (a) $39.40; (b) $100.58