A skilled worker in XYZ Ltd. is paid a guaranteed wage rate of 30 per hour. The standard time for a particular product is 4 hours. Mr. P, a machineman, has been paid wages under the Rowan Incentive Plan and he had earned an effective hourly rate of 537.50 on that manufacture of that particular product. What could have been his total earnings and effective hourly rate, had he been put on Halsey Incentive scheme (50%)