4. Assume that you are the manager of Manic Berhad. The total cost function is given as TC = 15 + 30 + 0.2Q and the product is sold at RM44 per unit. (a) Derive the average cost, average variable cost and marginal cost functions for the firm. (b) Determine the profit-maximising output level in the short run. (c) Discuss whether this firm will make any profits in the short run. 5. Pharmed Caplets is an antibiotic product with monthly revenues and costs of: TR = 900Q - 0.1Q2 TC = 36,000 + 200Q + 0.4Q2 (a) Set up a spreadsheet for output (Q), price (P), total revenue (TR), marginal revenue (MR), total cost (TC), marginal cost (MC), average cost (AC), total profit (), and marginal profit (MT). Establish a range for Q from 0 to 1,000 in increments of 100 (i.e., 0, 100, 200, ..., 1,000). (b) Based on your spreadsheet answer in part (a), at what price/output combination is total profit maximized? Why? (c) Based on your spreadsheet answer in part (a), at what price/output combination is average cost minimized? Why? (d) At what price/output combination is total revenue maximized? Why