a company uses a first-in, first -out(fifo) system and has 5,000 units in beginning work-in-process , 30% complete as to conversion costs.Conversion costs are incurred evently throughout the period.what is the number of equivalent units for conversion costs if 30,000 units were started during the period and there are 6,000 units in ending work-in-process that rae 20% complete?

a) 26,700 units

b) 28,700 units

c) 33,700 units

d) 34,700 units