David.
Radical Centrist
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First you need to calculate the future value of the roof. And then you can calculate the present value of that. What you've got there is the future value formula. Keep in mind that the interest rate used in these formulas is always divided by the number of payments in the year.
the second formula was listed right after specification of 't' = ten years, kind of hidden.
Figured it out.. numbers just werent coming out right but someone showed me how to flip the a for the p and the negative exponent correctly in the final equation.