Help Given the following information about a competitive firm's costs, calculate marginal cost and answer three questions, Instructions: If you are entering any negative numbers be sure to include a negative sign (-) in front of those numbers. Output (units) Total Cost Marginal Cost 10 11 52 12 50 13 62 14 70 15 80 16 92 17 106 18 122 140 a. If the prevailing market price is $14 per unit, units how much should the firm produce? b. How much profit will it earn at that output rate? C. If the firm increases output by 2 units, will it profit make more profit or less