A Worker Is Assigned Three Tasks,A,B,and C,each Having a Duration

Multiple Choice

A worker is assigned three tasks,A,B,and C,each having a duration of 20 days.One approach to completing these tasks would be to focus on one at a time,complete it,and then move to the second,followed by the third.One multitasking approach would call for dividing each task into fifths and rotating from one to the other so that the first fifths of A,B,and C are completed before the second fifths of A,B,and C are completed (always in this order) and so on until the activities are finished.What is the difference in the average completion times for the multitasked activities?

A) There is no difference in completion times for the two approaches.
B) The multitasked activities take 15% longer.
C) The multitasked activities take 25% longer.
D) The multitasked activities take 40% longer.