How do I find the average cost of goods sold and average cost of ending inventory?

What is average cost?

take total # of units purchased divide into the total cost = average cost.

average cost of ending inventory is units that remain after sales x average cost

total cost is,
take the total cost of your goods + add the over heads spent on those(transportation,etc.)= total cost
for example,
(total cost of goods) 5000 + (overheads) 500 = (total)5500
next,
if u have purchased 100 units of goods, therefore per unit is Rs.50 each,
but, u have spent other charges on it,
therefore...
u must divide the total number of units by your whole total expenditure...
(total spent) 5500 / (Divided by) 100 (units) =55 (average cost per unit)