The advertisement shows the cost of buying pencils from a stationery shop.
- Yoko bought 29 pencils. How much did she pay?
- Harry bought 60 pencils. How much did he pay?
(a)
Number of sets of 15 pencils
= 29 ÷ 15
= 1 r 14
Cost of first 15 pencils
= 15 x 4.50
= $67.50
Cost of the next 14 pencils
= 14 x 4.10
= $57.40
Amount that Yoko paid
= 67.50 + 57.40
= $124.90
(b)
Number of pencils that was not part of the first 15 pencils
= 60 - 15
= 45
Cost of first 15 pencils = $67.50
Cost of the next 45 pencils
= 45 x 4.10
= $184.50
Total cost of 60 pencils before an additional discount of 5% is applied
= 67.50 + 184.50
= $252
Amount that Harry paid in percent after an additional discount of 5% is applied
= 100% - 5%
= 95%
100% of the total cost of 60 pencils = 252
1% of the total cost of 60 pencils = 252 ÷ 100 = 2.52
95% of the total cost of 60 pencils = 95 x 2.52 = 239.40
Amount that Harry paid = $239.40
Answer(s): (a) $124.90; (b) $239.40