Calculate the earnings of a worker under (1) Halsey Plan and (2) Rowan Plan from the following particulars: (i) Hourly rate of wages guaranteed, `50 per hour; (ii) Standard time for producing one...

Calculate the earnings of a worker under (1) Halsey Plan and (2) Rowan Plan from the following particulars: (i) Hourly rate of wages guaranteed, `50 per hour; (ii) Standard time for producing one dozen articles—3 hours; (iii) Actual time taken by the worker to produce 20 dozen articles—48 hours.