The advertisement shows the cost of buying pencils from a book shop.
- Olivia bought 28 pencils. How much did she pay?
- Asher bought 100 pencils. How much did he pay?
(a)
Number of sets of 15 pencils
= 28 ÷ 15
= 1 r 13
Cost of first 15 pencils
= 15 x 4.50
= $67.50
Cost of the next 13 pencils
= 13 x 4.10
= $53.30
Amount that Olivia paid
= 67.50 + 53.30
= $120.80
(b)
Number of pencils that was not part of the first 15 pencils
= 100 - 15
= 85
Cost of first 15 pencils = $67.50
Cost of the next 85 pencils
= 85 x 4.10
= $348.50
Total cost of 100 pencils before an additional discount of 7% is applied
= 67.50 + 348.50
= $416
Amount that Asher paid in percent after an additional discount of 7% is applied
= 100% - 7%
= 93%
100% of the total cost of 100 pencils = 416
1% of the total cost of 100 pencils = 416 ÷ 100 = 4.16
93% of the total cost of 100 pencils = 93 x 4.16 = 386.88
Amount that Asher paid = $386.88
Answer(s): (a) $120.80; (b) $386.88
