In a shop, 2 files and 3 staplers cost $8.80. Joseph bought 3 files and 4 staplers at $12.10 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 = 8.80 --- (1)
3 F + 4 S = 12.10 --- (2)
(2) - (1)
1 F + 1 S = 12.10 --- 8.80
1 F + 1 S = 3.30 --- (3)
Cost of 1 file and 1 stapler = $3.30
(b)
(3)
x2 2 F + 2 S = 6.60 --- (4)
(1) - (4)
1 S = 8.80 - 6.60 = $2.20
Cost of 1 stapler = $2.20
Answer(s): (a) $3.30; (b) $2.20