AAH is considering various costs under process costing system. They adds direct materials at the start of its production process; conversion cost, on the other hand, is incurred evenly throughout manufacturing. The firm has no beginning work-in-process inventory; its ending work in process is 40% complete. Which of the following sets of percentages would be used to calculate the correct number of equivalent units in the ending work-in-process inventory?

a.

cannot be calculated with the information given

b.

Materials, 40%; conversion cost, 100%.

c.

Materials, 100%; conversion cost, 40%.

d.

Materials, 100%; conversion cost, 60%.

e.

Materials, 100%; conversion cost, 100%.