Answer:
d. 16.0 minutes
Step-by-step explanation:
Performance rating = (1+ Allowance factor)
Observed time = 160/384 (1-idletime) = 0.41667* (1-0.2) hrs per unit
standard time = Observed time * Performance rating
=0.3333 hrs/ unit
= 0.3333*(0.8)
= 0.26668 hrs per unit
= 0.26668*60 min/unit
= 16 min per unit
Therefore, the standard time is 16 min per unit