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Problem 20. Obsered Rating = 80% Observed time for a certain element = 10.6, 10.4, 11.4, 12.1, 9.8, 11.2 (6 observations) Relaxation allowance = 20% Calculate Normal Time and Standard Time. Problem 15. The fixed cost and variable cost for machining a casting in 3 machines are given below: Machine Fixed Costs Per Year Variable Cost Per Piece A B Rs. 10,000 Rs. 15.000 Rs. 20,000 Rs. 5 Rs. 3 Rs. 2 Problem 20. Obsered Rating = 80% Observed time for a certain element = 10.6, 10.4, 11.4, 12.1, 9.8, 11.2 (6 observations) Relaxation allowance = 20% Calculate Normal Time and Standard Time. Problem 15. The fixed cost and variable cost for machining a casting in 3 machines are given below: Machine Fixed Costs Per Year Variable Cost Per Piece A B Rs. 10,000 Rs. 15.000 Rs. 20,000 Rs. 5 Rs. 3 Rs. 2