The advertisement shows the cost of buying pens from a shop.
- Gem bought 17 pens. How much did she pay?
- Luke bought 70 pens. How much did he pay?
(a)
Number of sets of 15 pens
= 17 ÷ 15
= 1 r 2
Cost of first 15 pens
= 15 x 3.10
= $46.50
Cost of the next 2 pens
= 2 x 2.70
= $5.40
Amount that Gem paid
= 46.50 + 5.40
= $51.90
(b)
Number of pens that was not part of the first 15 pens
= 70 - 15
= 55
Cost of first 15 pens = $46.50
Cost of the next 55 pens
= 55 x 2.70
= $148.50
Total cost of 70 pens before an additional discount of 4% is applied
= 46.50 + 148.50
= $195
Amount that Luke paid in percent after an additional discount of 4% is applied
= 100% - 4%
= 96%
100% of the total cost of 70 pens = 195
1% of the total cost of 70 pens = 195 ÷ 100 = 1.95
96% of the total cost of 70 pens = 96 x 1.95 = 187.20
Amount that Luke paid = $187.20
Answer(s): (a) $51.90; (b) $187.20