In a shop, 2 files and 3 staplers cost $13.60. Joseph bought 3 files and 4 staplers at $19.20 from the book shop.
- Find the cost of 1 file and 1 stapler.
- What was the cost of 1 stapler?
(a)
Let 1 file be 1 F.
Let 1 stapler be 1 S.
2 F + 3 S = 13.60 --- (1)
3 F + 4 S = 19.20 --- (2)
(2) - (1)
1 F + 1 S = 19.20 --- 13.60
1 F + 1 S = 5.60 --- (3)
Cost of 1 file and 1 stapler = $5.60
(b)
(3)
x2 2 F + 2 S = 11.20 --- (4)
(1) - (4)
1 S = 13.60 - 11.20 = $2.40
Cost of 1 stapler = $2.40
Answer(s): (a) $5.60; (b) $2.40