Dave's Bikes, Incorporated purchases battery powered bikes from a manufacturer for $1,513 per unit and then sells them to its customers for $2,600 each. The companys monthly selling and administrative costs are the following: Costs Cost Formula Selling: Advertising $ 969 per month Sales salaries and commissions $ 4,810 per month, plus 4% of sales Delivery of bikes to customers $ 58 per unit sold Utilities $ 657 per month Depreciation of sales facilities $ 4,943 per month Administrative: Executive salaries $ 13,512 per month Insurance $ 719 per month Clerical $ 2,475 per month, plus $40 per unit sold Depreciation of office equipment $ 851 per month. Last month Dave's Bikes sold 60 units. How much was the company's total contribution margin for the month?