How to calculate the question 4 by using LIFO ?

On September 1, 2010, the beginning inventory was 110 units at $50 each. Purchases and sales during September 2010 were: What is the cost of ending inventory for September if the PERPETUAL AVERAGE costing alternative is used? (round your answer to the nearest penny) $6, 337.50 $6, 052.20 $5, 362.50 $6, 275.86 What is the cost of inventory on September 30 if the PERPETUAL LIFO costing alternative is used? $6, 620 $5, 520 $6, 480 $6, 500