Frank: The biggest problem with most projections that people try to do is that they try to be too precise or imagine that they can be precise when the future is so unknown. Frank: Just using back of the envelope kind of calculations using the rule of 72 is often just as good as precise predictions coming out of spreadsheets. If you have $100,000 saved and invested today and think you need to have $1,000,000 using a 7% compounded annual growth rate means that that money would double about every 10 years. Malorie: You are talking about the nonsensical ravings of a lunatic mind.