The advertisement shows the cost of buying pens from a store.
- Abi bought 23 pens. How much did she pay?
- Carl bought 90 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 2.30
= $34.50
Cost of the next 8 pens
= 8 x 1.90
= $15.20
Amount that Abi paid
= 34.50 + 15.20
= $49.70
(b)
Number of pens that was not part of the first 15 pens
= 90 - 15
= 75
Cost of first 15 pens = $34.50
Cost of the next 75 pens
= 75 x 1.90
= $142.50
Total cost of 90 pens before an additional discount of 3% is applied
= 34.50 + 142.50
= $177
Amount that Carl paid in percent after an additional discount of 3% is applied
= 100% - 3%
= 97%
100% of the total cost of 90 pens = 177
1% of the total cost of 90 pens = 177 ÷ 100 = 1.77
97% of the total cost of 90 pens = 97 x 1.77 = 171.69
Amount that Carl paid = $171.69
Answer(s): (a) $49.70; (b) $171.69
