The Mixture B is the answer! Hope this helps
        
                    
             
        
        
        
Answer:
419.25
Step-by-step explanation:
The calculation of the cost of materials for the cheapest such container is shown below:-
We assume
Width = x
Length = 2x
Height = h
where, length = 
Base area = lb
= 
Side area = 2lh + 2bh
= 2(2x)h + 2(x)h
= 4xh + 2xh
Volume = 24 which is lbh = 24

Now, cost is 

now we have to minimize C(x)
So, we need to compute the C'(x)

C"(x)  
now for the critical points, we will solve the equation C'(x) = 0


So, x is a point of minima that is
= 
Now, Base material cost is
 
= 139.75
Side material cost is
 
= 279.50
and finally 
Total cost is 
= 139.75 + 279.50
= 419.25
 
        
             
        
        
        
Answer:
<h2>6</h2>
Step-by-step explanation:
