The advertisement shows the cost of buying pens from a stationery shop.
- Emma bought 23 pens. How much did she pay?
- Perry bought 70 pens. How much did he pay?
(a)
Number of sets of 15 pens
= 23 ÷ 15
= 1 r 8
Cost of first 15 pens
= 15 x 4.30
= $64.50
Cost of the next 8 pens
= 8 x 3.90
= $31.20
Amount that Emma paid
= 64.50 + 31.20
= $95.70
(b)
Number of pens that was not part of the first 15 pens
= 70 - 15
= 55
Cost of first 15 pens = $64.50
Cost of the next 55 pens
= 55 x 3.90
= $214.50
Total cost of 70 pens before an additional discount of 3% is applied
= 64.50 + 214.50
= $279
Amount that Perry paid in percent after an additional discount of 3% is applied
= 100% - 3%
= 97%
100% of the total cost of 70 pens = 279
1% of the total cost of 70 pens = 279 ÷ 100 = 2.79
97% of the total cost of 70 pens = 97 x 2.79 = 270.63
Amount that Perry paid = $270.63
Answer(s): (a) $95.70; (b) $270.63