Well the above mentioned information is pretty basic math. And most of well educated adults would have solved these compounding problems by Class VI, Secondary School. 
Then, why do most of the people miss out on the above basic calculation when it comes to personal investing & money management?
It is similar to other aspects of life to a certain extent. For eg:, Everyone knows  that eating healthy food , staying fit, regular exercising etc. is good for healthy and happy life . But most of the people fall for junk food consistently or religiously spend time lazying in front of Idiot Box etc.
I think that most people underestimate the tremendous power of simplicity & on simple and good things of life in general. Also, it requires a lot of discipline, patience, consistency & conviction. Realize though, that Simplicity is ultimate sophistication.
Discipline and Patience are virtues which requires a lot of mental toughness. It is people with these virtues, more important than Intelligence or IQ, who successfully achieve their goals and much more than what they initially set their eyes on.

Moral : Markets and Life test patience but reward discipline and conviction.  Happy Long term Investing…