From the following particulars, you are required to work out the earnings of a worker for a week under

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(i) Straight Piece Rate; (ii) Differential Piece Rate; (iii) Halsey Premium Scheme (50% sharing) and (iv) Rowan Premium Scheme: Weekly working hours Hourly wage rate (Rs.) Piece rate per unit (Rs.) Normal time taken per piece Normal output per week Actual output for the week Differential piece rate 48 7.50 3.00 24 minutes 120 pieces 150 pieces 80% of piece rate when output is below normal and 120% of piece rate when output above normal.