The advertisement shows the cost of buying pencils from a stationery kiosk.
- Betty bought 29 pencils. How much did she pay?
- Sam 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 4.30
= $64.50
Cost of the next 14 pencils
= 14 x 4.10
= $57.40
Amount that Betty paid
= 64.50 + 57.40
= $121.90
(b)
Number of pencils that was not part of the first 15 pencils
= 70 - 15
= 55
Cost of first 15 pencils = $64.50
Cost of the next 55 pencils
= 55 x 4.10
= $225.50
Total cost of 70 pencils before an additional discount of 6% is applied
= 64.50 + 225.50
= $290
Amount that Sam paid in percent after an additional discount of 6% is applied
= 100% - 6%
= 94%
100% of the total cost of 70 pencils = 290
1% of the total cost of 70 pencils = 290 ÷ 100 = 2.9
94% of the total cost of 70 pencils = 94 x 2.9 = 272.60
Amount that Sam paid = $272.60
Answer(s): (a) $121.90; (b) $272.60
