The advertisement shows the cost of buying pencils from a stationery kiosk.
- Irene bought 27 pencils. How much did she pay?
- John bought 90 pencils. How much did he pay?
(a)
Number of sets of 15 pencils
= 27 ÷ 15
= 1 r 12
Cost of first 15 pencils
= 15 x 2.90
= $43.50
Cost of the next 12 pencils
= 12 x 2.70
= $32.40
Amount that Irene paid
= 43.50 + 32.40
= $75.90
(b)
Number of pencils that was not part of the first 15 pencils
= 90 - 15
= 75
Cost of first 15 pencils = $43.50
Cost of the next 75 pencils
= 75 x 2.70
= $202.50
Total cost of 90 pencils before an additional discount of 4% is applied
= 43.50 + 202.50
= $246
Amount that John paid in percent after an additional discount of 4% is applied
= 100% - 4%
= 96%
100% of the total cost of 90 pencils = 246
1% of the total cost of 90 pencils = 246 ÷ 100 = 2.46
96% of the total cost of 90 pencils = 96 x 2.46 = 236.16
Amount that John paid = $236.16
Answer(s): (a) $75.90; (b) $236.16