Hi al. I have a problema. I know it is possible with a very simple operation. This is the problema: I have a value, I want to add a percentage to it, and then remove that percentage but now of the new value and keep the original value: if I have 100, add 15%, it gives me 115, but now if I take the 15% of the 115, I have 97.75. I want the formula to add the initial 15% in such way that I can take 15% of the total value and keep the original 100. Any help please? Regards Virginio Reis P.S. Some how the fórum does not accept the carriage return, so the post goes in a single line.