37. Econ Pty Ltd produced and sold 45 000 units of a single product last year. Data concerning the year's profit and loss statement are as follows: Sales revenue $1350000 Manufacturing cost Variable $ 585000 Fixed $ 270000 Selling costs Variable $ A 0500 Fixed 5 4000 Administrative cost Variable $ 585000 Fixed $ 108000 What was Econ's total contribution margin for the year? A. $495 000 B. $540 000 C. $724 500 D. $810 000