please explain the step process

A company had the following purchases and sales during its first year of operations January February: May: September: November 10 units at $120 20 units at $125 15 units at $130 12 units at $135 10 units at $140 Sales 6 units 5 units 9 units 8 units 13 units On December 31, there were 26 units remaining in ending inventory. Using the perpetual FIFO inventory costing method, what is the cost of the ending inventory? (Assume all sales were made on the last day of the month) Multiple Choice $3.405 $3.200 O search L F K L B NM