The formula to calculate the Leontief Production Equation (PTO) is:
\[ PTO = IC + ED \]
Where:
Let's say the internal consumption (IC) is 500 units and the external demand (ED) is 300 units. Using the formula:
\[ PTO = 500 + 300 = 800 \]
So, the total output (PTO) is 800 units.