The advertisement shows the cost of buying pens from a book shop.
- Xuan bought 26 pens. How much did she pay?
- George bought 50 pens. How much did he pay?
(a)
Number of sets of 15 pens
= 26 ÷ 15
= 1 r 11
Cost of first 15 pens
= 15 x 4.10
= $61.50
Cost of the next 11 pens
= 11 x 3.70
= $40.70
Amount that Xuan paid
= 61.50 + 40.70
= $102.20
(b)
Number of pens that was not part of the first 15 pens
= 50 - 15
= 35
Cost of first 15 pens = $61.50
Cost of the next 35 pens
= 35 x 3.70
= $129.50
Total cost of 50 pens before an additional discount of 7% is applied
= 61.50 + 129.50
= $191
Amount that George paid in percent after an additional discount of 7% is applied
= 100% - 7%
= 93%
100% of the total cost of 50 pens = 191
1% of the total cost of 50 pens = 191 ÷ 100 = 1.91
93% of the total cost of 50 pens = 93 x 1.91 = 177.63
Amount that George paid = $177.63
Answer(s): (a) $102.20; (b) $177.63