Milani Mousetraps uses the FIFO method when performing process costing. It had 1,200 units in beginning work in process at the start of the period. These units were fully complete with respect to materials but only had 40% of their conversion costs. During the period, 4,600 units were started, and at the end of period 800 units remained in ending work in process. The ending work in process units had all of their direct materials but only 25% of their conversion costs. Equivalent units for conversion costs would be:
a. 5,920 units
b. 800 units
c. 5,000 units
d. 5,200 units