The advertisement shows the cost of buying pencils from a stationery shop.
- Gwen bought 19 pencils. How much did she pay?
- Brandon bought 60 pencils. How much did he pay?
(a)
Number of sets of 15 pencils
= 19 ÷ 15
= 1 r 4
Cost of first 15 pencils
= 15 x 3.50
= $52.50
Cost of the next 4 pencils
= 4 x 3.10
= $12.40
Amount that Gwen paid
= 52.50 + 12.40
= $64.90
(b)
Number of pencils that was not part of the first 15 pencils
= 60 - 15
= 45
Cost of first 15 pencils = $52.50
Cost of the next 45 pencils
= 45 x 3.10
= $139.50
Total cost of 60 pencils before an additional discount of 6% is applied
= 52.50 + 139.50
= $192
Amount that Brandon paid in percent after an additional discount of 6% is applied
= 100% - 6%
= 94%
100% of the total cost of 60 pencils = 192
1% of the total cost of 60 pencils = 192 ÷ 100 = 1.92
94% of the total cost of 60 pencils = 94 x 1.92 = 180.48
Amount that Brandon paid = $180.48
Answer(s): (a) $64.90; (b) $180.48