Answer:
1 rubber cost is 0.59
Explanation:
The computation of the cost of one rubber is shown below:
Given that
6 pencil cost = 1.68
3 pencils and 1 rubber cost = 1.09
based on the above information
one pencil cost is
= 1.68 ÷ 3
= 0.56
Now
3(0.56) + 1 rubber = 1.09
So, 1 rubber cost is 0.59