Total Revenue (TR) is calculated by multiplying the quantity of goods sold (Q) by the price of the goods (P).

For example, if you sold 120 pens for N2 each: To find your Profit: You will have to subtract the Total Cost (TC) from your Total Revenue(TR).

Recall that we defined a firm's short-run total costs as

Total Cost = TFC + TVC.

Now we can define economic profit as: 

Profit = Total Revenue - Total Cost