The formula to calculate the Total Grain Loss (TGL) is:
\[ TGL = HA \times GLA \]
Where:
Let's say the harvested area is 100 acres and the grain loss per area is 2 bushels per acre. Using the formula:
\[ TGL = 100 \times 2 \]
We get:
\[ TGL = 200 \]
So, the total grain loss is 200 bushels.