Question 2) For a four-month inventory problem, the demand and cost data for each month are provided in the following table. The products are produced in 5 batches. The initial inventory available at the beginning of the first month is 5 units and it is desired to have 5 units at the end of the 4th month. a. Use dynamic programming to find the optimal policy and minimum total cost (use backward recursion). (pdf file) b. Find the optimal policy by using dynamic programming in EXCEL