Suppose in a factory there are 25 welders. Following expenses (in Rs.) are incurred for keeping them work: The total number of labor hours put in by welders is 5000 (assuming a welder works for 8 hours a day and 25 days in a month). Normal wage for a welder ( 8 hours a day) is Rs. 400 per day. Hence if a job is done by 5 welders in 6 days how much cost is charged