This is from my practice exercise. Please, could you state the process and maybe a description when you are solving it. My purpose is to understand rather than see just the answer. Thanks. This is from Production Plan and Control from Industrial Engineering

PRACTICE EXERCISE SUMMER 2018 Meadows Cookie Company makes a variety of chocolate chip cookies in the plant in Albion, Michigan. Based on orders received and forecasts of buying habits it is estimated that the demand for the next four months is 850, 1260, 510, and 980 expressed in thousands of cookies. During a 46 day period when there were 120 workers the company produced 1.7 million cookies. Assume that the number of workdays over the four months are respectively 26, 24, 20, and 16. There are currently 100 workers employed, and there is no starting inventory of cookies. a) What is the minimum constant workforce required to meet demand over the next four months? b) Assume that c = 10 cents per cookie per month, Ch = $100, and CF = $200. Evaluate the cost of the plan derived in part a. c) What is the zero inventory plan for this problem? d) Evaluate the cost of the zero inventory plan