Variable Costing Marsich Company has the following information for March: Sales $360,000 Variable cost of goods sold 172,800 Fixed manufacturing costs 61,200 Variable selling and administrative expenses 32,400 Fixed selling and administrative expenses 21,600 Determine the following for Marsich Company for the month of March: a. Manufacturing margin $fill in the blank 1 b. Contribution margin $fill in the blank 2 c. Income from operations $fill in the blank 3