Wilmer Ok, I really thank you very much.
Look, I was doing it correctly for depreciation, only that I fixed that excel cells started the series in row 4 (how silly).
I have only one doubt as to the equation to solve numerically the equation of the fees in the first problem, suppose that is a debt to repay in 3 years, if not ten., etc.
In it's that you say that the calculation is complex, right?
Sorry to be so heavy, and finally, when you found that fee down there, which was solved numerically the equation? I can expand in the event that the term is larger as I said?