A worker is allowed to take 9 hours to complete a job on daily wages and 6 hours on a scheme of payment by results. His daily rate is Rs 7.5 per hour. The material cost is Rs 40 and the overheads are...

A worker is allowed to take 9 hours to complete a job on daily wages and 6 hours on a scheme of payment by results. His daily rate is Rs 7.5 per hour. The material cost is Rs 40 and the overheads are recovered at 150 per cent of the total direct wages. Calculate the factory cost of the product under (i) piece-work plan, (ii) Halsey Plan and (iii) Rowan Plan, assuming work is completed in 6 hours.