For a manual operation to study the total processing standard time using a chronometer, following observations were made:
Processing time : 16 minutes
Rating of the worker : 120%
Personal allowance : 0.6 minutes
Basic fatigue allowance : 1.92 minutes
Unavoidable delay allowance : 1.08 minutes
What is the standard operating time for the operation?
(a) 16 minutes (b) 17.92 minutes
(c) 21.52 minutes (d) None of the above