The following information relates to Lancashire Manufacturing: To produce a unit of product:

Mixing department	3 minutes per unit
Molding department	5 minutes per unit
Casting department	7 minutes per unit
Finishing department	4 minutes per unit

There is a wait time of 8 minutes before the mixing department begins a batch, 5 minutes between the mixing and molding departments, a move and pre-wait between molding and casting of 10 minutes, and a move and pre-wait between the casting and finishing departments of 12 minutes. How long does it take to produce a batch of 20 units under a traditional manufacturing approach?

a.380 minutes

b.415 minutes

c.35 minutes

d.None of these choices are correct.