the following information has been extracted from the cost sheet of a company , raw materials rs 45 per unit. direct labour rs 20 per unit, overheads rs 40 per unit , total rs 105 per unit, profit rs 15 per unit, selling price rs 120 per unit. the following further information is available : 1. raw materials are in stock on an average two months. 2. the materials are in process on an average for 4 weeks. the degree of completion is 50 % in all rspects. 3. finished goods stock on an average is for one month. 4 time lag in payment of wages and overheads 1.5 weeks. 6. crredit allowed by suppliers is one month. 7. time