Sackville Marketing purchases novelty gift items from a wholesaler at a cost of $5 each and sells them at retail for $11 each. Sackville's monthly expenses are as follows. Rent $800 Sales wages/commissions 51000 month + 5% of sales Utilities $160 per month Depreciation on equipment $120 per month of 6 000 units are sold during March what is Sackville's total contribution margin for the month? Select one a $30 000 b. 546 200 C. 536 000 O d. 532 700