How would buying put options allow an investor to protect his or her gains made from an increase in stock prices

Aproduction department's output for the most recent month consisted of 8,000 units completed and transferred to the next stage of production and 5,000 units in ending work in process inventory. the units in ending work in process inventory were 50% complete with respect to both direct materials and conversion costs. calculate the equivalent units of production for the month, assuming the company uses the weighted average method.