The advertisement shows the cost of buying pencils from a book shop.
- Wendy bought 28 pencils. How much did she pay?
- Ryan bought 70 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 Wendy paid
= 67.50 + 53.30
= $120.80
(b)
Number of pencils that was not part of the first 15 pencils
= 70 - 15
= 55
Cost of first 15 pencils = $67.50
Cost of the next 55 pencils
= 55 x 4.10
= $225.50
Total cost of 70 pencils before an additional discount of 8% is applied
= 67.50 + 225.50
= $293
Amount that Ryan paid in percent after an additional discount of 8% is applied
= 100% - 8%
= 92%
100% of the total cost of 70 pencils = 293
1% of the total cost of 70 pencils = 293 ÷ 100 = 2.93
92% of the total cost of 70 pencils = 92 x 2.93 = 269.56
Amount that Ryan paid = $269.56
Answer(s): (a) $120.80; (b) $269.56
