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The beginning inventory for ZY company was 300 units with a unit cost of $6, the company made the following purchases: January 200 units at $6.50, February 170 units at $7 and March 140 units at $7.20. At the end of March, the inventory on hand was 180 units. Using the average-cost method, the cost of goods sold at the end March was O a. $ 4725 O b. $ 4120 O c. $ 4410 O d. $ 4095 Blue Company uses a periodic inventory system. The inventory records for January 2021 are as follows: the balance in 1/1/2021 was 200 units at $5, purchases on 10/1/2021 were 100 units at $5.30, and purchases on 20/1/2021 were 100 units at $5.50. the balance of inventory at 31/1/2021 was 120 units. Using the FIFO method, the cost of goods sold was: O a. $600 O b. $656 O c. $520 O d. $1,424