The advertisement shows the cost of buying pens from a bookstore.
- Hilda bought 17 pens. How much did she pay?
- Peter bought 70 pens. How much did he pay?
(a)
Number of sets of 15 pens
= 17 ÷ 15
= 1 r 2
Cost of first 15 pens
= 15 x 2.90
= $43.50
Cost of the next 2 pens
= 2 x 2.70
= $5.40
Amount that Hilda paid
= 43.50 + 5.40
= $48.90
(b)
Number of pens that was not part of the first 15 pens
= 70 - 15
= 55
Cost of first 15 pens = $43.50
Cost of the next 55 pens
= 55 x 2.70
= $148.50
Total cost of 70 pens before an additional discount of 3% is applied
= 43.50 + 148.50
= $192
Amount that Peter paid in percent after an additional discount of 3% is applied
= 100% - 3%
= 97%
100% of the total cost of 70 pens = 192
1% of the total cost of 70 pens = 192 ÷ 100 = 1.92
97% of the total cost of 70 pens = 97 x 1.92 = 186.24
Amount that Peter paid = $186.24
Answer(s): (a) $48.90; (b) $186.24