In a shop, 4 notebooks and 5 staplers cost $20.60. Joseph bought 5 notebooks and 6 staplers at $25.30 from the book shop.
- Find the cost of 1 notebook and 1 stapler.
- What was the cost of 1 stapler?
(a)
Let 1 notebook be 1 N.
Let 1 stapler be 1 S.
4 N + 5 S = 20.60 --- (1)
5 N + 6 S = 25.30 --- (2)
(2) - (1)
1 N + 1 S = 25.30 --- 20.60
1 N + 1 S = 4.70 --- (3)
Cost of 1 notebook and 1 stapler = $4.70
(b)
(3)
x4 4 N + 4 S = 18.80 --- (4)
(1) - (4)
1 S = 20.60 - 18.80 = $1.80
Cost of 1 stapler = $1.80
Answer(s): (a) $4.70; (b) $1.80