A skilled worker in XYZ Ltd. is paid a guaranteed wage rate of 30 per hour. The standard time per unit for a particular product is 4 hours. P, a machineman, has been paid wages under the Rowan Incentive plan and he had earned on effective hourly rate of 37.50 on the manufacture of the particular product. What could have been his total earnings and effective hourly rate, had he been put on Halsey Incentive Scheme (50%)