You work for a wholesale firm which distributes a single product. $57,600 is the value for opening inventory (1 Oct 2020). Closing inventory valuation conducted on 31 October 2020 , $80640 Purchases during the month were: Sales during the month were: The other cost besides the purchases were: Wages of staff $44,700; Premises purchased $42,750; Administrative expenses $13,620; Selling and marketing costs $17,890; Cost and freight for purchased inventory $3,750; Carriage outwards $4,120 and Depreciation charges $11,250 Based on the data provided what is the cost of sales for the month of October 2020