Answer and Explanation:
The computation is shown below:
The Value added lead time is
= (cutting & assembly + decorating process time)
= 3 minutes + 9 minutes
= 12 minutes
For Non-value added lead time :
Move time = 4 minutes
Now
within batch wait time = value added time × ( batch size - 1)
= (3 + 9) × ( 12 - 1)
= 132 minutes
So,
Total lead time = 144 minutes