The advertisement shows the cost of buying pencils from a bookstore.
- Joelle bought 17 pencils. How much did she pay?
- Vincent bought 90 pencils. How much did he pay?
(a)
Number of sets of 15 pencils
= 17 ÷ 15
= 1 r 2
Cost of first 15 pencils
= 15 x 1.50
= $22.50
Cost of the next 2 pencils
= 2 x 1.30
= $2.60
Amount that Joelle paid
= 22.50 + 2.60
= $25.10
(b)
Number of pencils that was not part of the first 15 pencils
= 90 - 15
= 75
Cost of first 15 pencils = $22.50
Cost of the next 75 pencils
= 75 x 1.30
= $97.50
Total cost of 90 pencils before an additional discount of 8% is applied
= 22.50 + 97.50
= $120
Amount that Vincent paid in percent after an additional discount of 8% is applied
= 100% - 8%
= 92%
100% of the total cost of 90 pencils = 120
1% of the total cost of 90 pencils = 120 ÷ 100 = 1.2
92% of the total cost of 90 pencils = 92 x 1.2 = 110.40
Amount that Vincent paid = $110.40
Answer(s): (a) $25.10; (b) $110.40
