Weighted average cost flow method under perpetual inventory system

The following units of a particular item were available for sale during the calendar year:

Date Line Item Description Units and Cost

Jan. $1$ Inventory $9,000$ units at $$50\mathrm{.}00$

Mar. $18$ Sale $7,000$ units

May $2$ Purchase $8,000$ units at $$56\mathrm{.}50$

Aug. $9$ Sale $8,000$ units

Oct. $20$ Purchase $4,000$ units at $$60\mathrm{.}00$

The firm uses the weighted average cost method with a perpetual inventory system. Determine the cost of goods sold for each sale and the inventory balance after each sale. Present the data in the form illustrated in Exhibit $5.$ Round your "Unit Cost" answers to two decimal places.