The advertisement shows the cost of buying pens from a stationery kiosk.
- Lynn bought 28 pens. How much did she pay?
- Ivan bought 60 pens. How much did he pay?
(a)
Number of sets of 15 pens
= 28 ÷ 15
= 1 r 13
Cost of first 15 pens
= 15 x 3.10
= $46.50
Cost of the next 13 pens
= 13 x 2.90
= $37.70
Amount that Lynn paid
= 46.50 + 37.70
= $84.20
(b)
Number of pens that was not part of the first 15 pens
= 60 - 15
= 45
Cost of first 15 pens = $46.50
Cost of the next 45 pens
= 45 x 2.90
= $130.50
Total cost of 60 pens before an additional discount of 4% is applied
= 46.50 + 130.50
= $177
Amount that Ivan paid in percent after an additional discount of 4% is applied
= 100% - 4%
= 96%
100% of the total cost of 60 pens = 177
1% of the total cost of 60 pens = 177 ÷ 100 = 1.77
96% of the total cost of 60 pens = 96 x 1.77 = 169.92
Amount that Ivan paid = $169.92
Answer(s): (a) $84.20; (b) $169.92
