The advertisement shows the cost of buying pens from a stationery kiosk.
- Sarah bought 17 pens. How much did she pay?
- Albert 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 3.30
= $49.50
Cost of the next 2 pens
= 2 x 2.90
= $5.80
Amount that Sarah paid
= 49.50 + 5.80
= $55.30
(b)
Number of pens that was not part of the first 15 pens
= 70 - 15
= 55
Cost of first 15 pens = $49.50
Cost of the next 55 pens
= 55 x 2.90
= $159.50
Total cost of 70 pens before an additional discount of 10% is applied
= 49.50 + 159.50
= $209
Amount that Albert paid in percent after an additional discount of 10% is applied
= 100% - 10%
= 90%
100% of the total cost of 70 pens = 209
1% of the total cost of 70 pens = 209 ÷ 100 = 2.09
90% of the total cost of 70 pens = 90 x 2.09 = 188.10
Amount that Albert paid = $188.10
Answer(s): (a) $55.30; (b) $188.10
