How would solve something like this?

Splish Brothers Inc. had 165 units in beginning inventory at a total cost of $19,800. The company purchased 330 units at a total cost of $59,400. At the end of the year, Splish Brothers had 80 units in ending inventory. (a) Compute the cost of the ending inventory and the cost of goods sold under FIFO, LIFO, and average-cost. (Round average-cost per unit and final answers to O decimal places, e.g. 1,250.) FIFO LIFO Average-cost The cost of the ending inventory The cost of goods sold