The advertisement shows the cost of buying pencils from a stationery shop.
- Hazel bought 17 pencils. How much did she pay?
- Zeph 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 2.30
= $34.50
Cost of the next 2 pencils
= 2 x 2.10
= $4.20
Amount that Hazel paid
= 34.50 + 4.20
= $38.70
(b)
Number of pencils that was not part of the first 15 pencils
= 90 - 15
= 75
Cost of first 15 pencils = $34.50
Cost of the next 75 pencils
= 75 x 2.10
= $157.50
Total cost of 90 pencils before an additional discount of 5% is applied
= 34.50 + 157.50
= $192
Amount that Zeph paid in percent after an additional discount of 5% is applied
= 100% - 5%
= 95%
100% of the total cost of 90 pencils = 192
1% of the total cost of 90 pencils = 192 ÷ 100 = 1.92
95% of the total cost of 90 pencils = 95 x 1.92 = 182.40
Amount that Zeph paid = $182.40
Answer(s): (a) $38.70; (b) $182.40
