I need to answer these questions and work them out

Which of the following would NOT be considered a period cost? The salary of the company president's secretary The cost of a firm's accounting department Depreciation of a machine used in manufacturing D. Sales commissions A firm is trying to decide whether to keep an old machine or buy a new one that will perform similar tasks. Which of the following costs is irrelevant to making this decision? Original cost of the old machine Cost to purchase the new machine Difference in operating costs for the two machines Cost of training workers to use the new machine When direct materials are requisitioned from an on-site warehouse, the cost of these materials is transferred to which account: Finished goods Cost of goods sold Raw materials Work in Process A firm's complete set of budgets and supporting schedules is known as the: Master budget. Administrative budget. Operations budget. Financial budget. As the number of units produced by a manufacturer increases: Total fixed costs per unit increase. Total variable costs stay die same, Fixed costs per unit decrease. Variable costs per unit increase. A firm sells one product with a contribution margin per unit of $20 and a contribution margin ratio of.4. Which of the following is TRUE? For every SI of sales revenue, $.60 is available to cover fixed costs and generate operating income. For every unit sold, $20 must go toward covering variable costs. For every $1 of sales revenue, S.40 is available to cover fixed costs and generate operating income. For every unit sold, $8 must go toward covering variable costs