Answer:

Step-by-step explanation:
Given
See attachment for graph
Required
The unit cost
Pick any point on the dots of the graph; we have:

The unit cost is then calculated as:


Converting everything to decimals:
0.25 inch, 0.5 inch, 0.4 inch
Ordering:
0.25, 0.4, 0.5
Converting the appropriate numbers back to fractions:
1/4,10/25,0.5.
-24/4=-6
x^-7x+6=0
(x-6)(x-1)=0
x=6 or x=1