The advertisement shows the cost of buying pencils from a stationery kiosk.
- Jaslyn bought 27 pencils. How much did she pay?
- Xavier 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 1.90
= $28.50
Cost of the next 12 pencils
= 12 x 1.70
= $20.40
Amount that Jaslyn paid
= 28.50 + 20.40
= $48.90
(b)
Number of pencils that was not part of the first 15 pencils
= 100 - 15
= 85
Cost of first 15 pencils = $28.50
Cost of the next 85 pencils
= 85 x 1.70
= $144.50
Total cost of 100 pencils before an additional discount of 5% is applied
= 28.50 + 144.50
= $173
Amount that Xavier paid in percent after an additional discount of 5% is applied
= 100% - 5%
= 95%
100% of the total cost of 100 pencils = 173
1% of the total cost of 100 pencils = 173 ÷ 100 = 1.73
95% of the total cost of 100 pencils = 95 x 1.73 = 164.35
Amount that Xavier paid = $164.35
Answer(s): (a) $48.90; (b) $164.35