The advertisement shows the cost of buying pencils from a store.
- Barbara bought 24 pencils. How much did she pay?
- Perry bought 60 pencils. How much did he pay?
(a)
Number of sets of 15 pencils
= 24 ÷ 15
= 1 r 9
Cost of first 15 pencils
= 15 x 3.90
= $58.50
Cost of the next 9 pencils
= 9 x 3.70
= $33.30
Amount that Barbara paid
= 58.50 + 33.30
= $91.80
(b)
Number of pencils that was not part of the first 15 pencils
= 60 - 15
= 45
Cost of first 15 pencils = $58.50
Cost of the next 45 pencils
= 45 x 3.70
= $166.50
Total cost of 60 pencils before an additional discount of 6% is applied
= 58.50 + 166.50
= $225
Amount that Perry paid in percent after an additional discount of 6% is applied
= 100% - 6%
= 94%
100% of the total cost of 60 pencils = 225
1% of the total cost of 60 pencils = 225 ÷ 100 = 2.25
94% of the total cost of 60 pencils = 94 x 2.25 = 211.50
Amount that Perry paid = $211.50
Answer(s): (a) $91.80; (b) $211.50