Spanner company is a retailer that uses the periodic inventory system. on march 1, it had 100 units of product m at a cost of $1590. On march 6 spanner purchased 200 units of m for $3600. on march 10 it purchased 125 units of m for $3000. on march 15 it sold 200 units of m for $6000. calculate the march cost of goods sold and ending inventory at march 31 using (A) first in-first out (B) last in first out and (C) the weighted-average cost method. round your final answer to the nearest dollar.