Please answer the following concept questions in concise bullet points: a. Why is the number of operators per shift multiplied by approximately 4.5 to obtain the total number of operators required to run the plant? Explain the logic and show the underlying calculations. b. Briefly explain the difference between direct costs, fixed costs, and general expenses. Give two examples of each. c. In the general equation for determining the cost of manufacturing without depreciation (COMd), one of the terms is 0.180FCI, where FCI is the fixed capital investment of the plant. "This term is included to cover the interest payment on the loan for the plant." Is this statement true or false? Explain your