Answer: Min 5KS+6ND+8WA
Explanation:
For the objective function to be formulated, we have to minimize the cost. For this to be done, the capacity constraint which is given in the question as 22000 ton/year has to be satisfied.
For this question, the objective function will be to minimize 5KS + 6ND + 8WA. It should be noted that KS, ND and WA in this context are binary variables where 0 represents non-selected farm and 1 represents selected farm.