The advertisement shows the cost of buying pencils from a stationery shop.
- Irene bought 27 pencils. How much did she pay?
- Cody bought 100 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 3.50
= $52.50
Cost of the next 12 pencils
= 12 x 3.30
= $39.60
Amount that Irene paid
= 52.50 + 39.60
= $92.10
(b)
Number of pencils that was not part of the first 15 pencils
= 100 - 15
= 85
Cost of first 15 pencils = $52.50
Cost of the next 85 pencils
= 85 x 3.30
= $280.50
Total cost of 100 pencils before an additional discount of 7% is applied
= 52.50 + 280.50
= $333
Amount that Cody paid in percent after an additional discount of 7% is applied
= 100% - 7%
= 93%
100% of the total cost of 100 pencils = 333
1% of the total cost of 100 pencils = 333 ÷ 100 = 3.33
93% of the total cost of 100 pencils = 93 x 3.33 = 309.69
Amount that Cody paid = $309.69
Answer(s): (a) $92.10; (b) $309.69