The Molding Department of the Smith Company has the following production data: beginning work in process 20,000 units (60% complete), started in production 340,000 units, completed and transferred out 320,000 units, and ending working process 40,000 units (40% complete). Assume materials are entered at the beginning of the process, the equivalent units under the FIFO method for materials are:

a)

340,000.

b)

320,000.

c) 300,000.

d) 380,000.

Please show work. It says the answer is a) but I don't know why it says that. Thank you.