The advertisement shows the cost of buying pens from a shop.
- Victoria bought 19 pens. How much did she pay?
- Vincent bought 50 pens. How much did he pay?
(a)
Number of sets of 15 pens
= 19 ÷ 15
= 1 r 4
Cost of first 15 pens
= 15 x 1.50
= $22.50
Cost of the next 4 pens
= 4 x 1.10
= $4.40
Amount that Victoria paid
= 22.50 + 4.40
= $26.90
(b)
Number of pens that was not part of the first 15 pens
= 50 - 15
= 35
Cost of first 15 pens = $22.50
Cost of the next 35 pens
= 35 x 1.10
= $38.50
Total cost of 50 pens before an additional discount of 4% is applied
= 22.50 + 38.50
= $61
Amount that Vincent paid in percent after an additional discount of 4% is applied
= 100% - 4%
= 96%
100% of the total cost of 50 pens = 61
1% of the total cost of 50 pens = 61 ÷ 100 = 0.61
96% of the total cost of 50 pens = 96 x 0.61 = 58.56
Amount that Vincent paid = $58.56
Answer(s): (a) $26.90; (b) $58.56