Crazy money advice

Robert Kiyosaki has an interesting post here about money. Unfortunately, most of his "advice" doesn't make sense. And his math doesn't either: he estimates that $25000 in 40 years will be equivalent to $250 today. What kind of inflation rate gives a 100-fold decrease in purchasing power in 40 years? Even a 10-percent rate of inflation would only give a 45-fold decrease in purchasing power.