The advertisement shows the cost of buying pencils from a stationery kiosk.
- Fanny bought 29 pencils. How much did she pay?
- Cole bought 70 pencils. How much did he pay?
(a)
Number of sets of 15 pencils
= 29 ÷ 15
= 1 r 14
Cost of first 15 pencils
= 15 x 1.50
= $22.50
Cost of the next 14 pencils
= 14 x 1.30
= $18.20
Amount that Fanny paid
= 22.50 + 18.20
= $40.70
(b)
Number of pencils that was not part of the first 15 pencils
= 70 - 15
= 55
Cost of first 15 pencils = $22.50
Cost of the next 55 pencils
= 55 x 1.30
= $71.50
Total cost of 70 pencils before an additional discount of 9% is applied
= 22.50 + 71.50
= $94
Amount that Cole paid in percent after an additional discount of 9% is applied
= 100% - 9%
= 91%
100% of the total cost of 70 pencils = 94
1% of the total cost of 70 pencils = 94 ÷ 100 = 0.94
91% of the total cost of 70 pencils = 91 x 0.94 = 85.54
Amount that Cole paid = $85.54
Answer(s): (a) $40.70; (b) $85.54