Question: how to calculate the percentage of cost of goods sold?
Answer: Find out your COGS (cost of goods sold). ...  Find out your revenue (how much you sell these goods for, for example $50 ). Calculate the gross profit by subtracting the cost from the revenue. ...  Divide gross profit by revenue: $20 / $50 = 0.4 . Express it as percentages: 0.4 * 100 = 40% .