To remove almost all of the sodium and minerals
        
             
        
        
        
Answer:
(a) $33750000 (b) $11250000 (c) $22500000
Explanation:
Solution
(a) How much would Ziegler Inc. total income of operating  increase.
Now,
Units * (Cost of purchased from outside supplier - Variable cost)
Thus,
75000 * ($1350 - $900) = $33750000
(b) How much would the Instrument Division's operating income increase
Now,
The Units * (Cost of purchased from outside supplier - Transfer Price)
So,
75000 units * ($1350 - $1200) = $11250000
(C) How much would the Components Division's operating income increase?
Now,
Units * (Transfer Price - Variable cost)
75000 units * ($1200 - $900) = $22500000
 
        
             
        
        
        
Answer
The answer and procedures of the exercise are attached in the following image.
Explanation  
Please consider the data provided by the exercise. If you have any question please write me back. All the exercises are solved in a single sheet with the formulas indications.  
 
        
             
        
        
        
Question is incomplete as the cost of the sidewalk is not given :
Assume the sidewalk cost an additional $6 per foot. 
Answer:
$8366
Explanation:
Given that :
Size of porch = 16 by 18 feets
Area of porch = (16 * 18) = 288 ft²
Cost per ft² = $27
Cost of porch = ($27 * 288) = $7,776
Sidewalk = 15feets
Cost per foot = $6
Cost of sidewalk = ($6 * 15) = $90
Cost of gate = $500
Total cost :
(cost of porch area + side walk + gate)
($7776 + $90 + $500) = $8366
Kindly note that the cost pwr foot of sidewalk was erroneously excluded and the value employed for the cost was only assumed.