Final answer:
The equivalent units of labor added by the end of the period is 47,400 units.
Step-by-step explanation:
The number of equivalent units of labor added by the end of the period can be calculated using the weighted-average inventory valuation method. The formula to calculate the equivalent units is:
Equivalent Units = Units completed and transferred + (Units in process x % completion)
In this case, the units completed and transferred is 37,500 units. The units in process at one-fifth completion are 12,000 units, and the units in process at three-fifths completion are 12,500 units. So, the equivalent units of labor added by the end of the period is:
Equivalent Units = 37,500 + (12,000 x 1/5) + (12,500 x 3/5) = 37,500 + 2,400 + 7,500 = 47,400 units