Hi Vitalli, Excel spreadsheet... You should be able to take the cell that contains this equation: = [100% * (LOG(100.00 - LOG(1.00))] + LOG(1.00) and change it to: = 10^[100% * (LOG(100.00 - LOG(1.00))] + LOG(1.00), or = power(10, [100% * (LOG(100.00 - LOG(1.00))] + LOG(1.00)) Hope it helps. -AIMStudent