Step 1: Find the cost of runes and soft clay
Step 2: Go to Ge database to find the cost of the tabs and resources
Step 3 (optional): learn kindergarten math
Step 4: Add the cost together
Step 5: Subtract the difference between the tabs and raw materials.
This may work if your just making one or two tabs, but some tabs are made quicker than others. Meaning that some are more profitable than others due to the fact that you can them quicker.

