The advertisement shows the cost of buying pens from a stationery shop.
- Tammy bought 28 pens. How much did she pay?
- Simon bought 50 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 1.90
= $28.50
Cost of the next 13 pens
= 13 x 1.70
= $22.10
Amount that Tammy paid
= 28.50 + 22.10
= $50.60
(b)
Number of pens that was not part of the first 15 pens
= 50 - 15
= 35
Cost of first 15 pens = $28.50
Cost of the next 35 pens
= 35 x 1.70
= $59.50
Total cost of 50 pens before an additional discount of 6% is applied
= 28.50 + 59.50
= $88
Amount that Simon paid in percent after an additional discount of 6% is applied
= 100% - 6%
= 94%
100% of the total cost of 50 pens = 88
1% of the total cost of 50 pens = 88 ÷ 100 = 0.88
94% of the total cost of 50 pens = 94 x 0.88 = 82.72
Amount that Simon paid = $82.72
Answer(s): (a) $50.60; (b) $82.72