Explain in your main post what economic variables you can use this formula to calculate. Give an example calculation that shows, step by step, how to use the formula to do the calculation.

You only need to give one example in your main post. That is, if your formula is a+b=c. You can use it to calculate a, or b, or c. Your example should be the calculation of a, or b, or c, not all three of them.