2 ms·
The rule of 72 for me is a classic that comes to my mind. http://en.wikipedia.org/wiki/Rule_of_72 http://en.wikipedia.org/wiki/Rule_of_72
by keyle 16y ago
The rule of 72 for me is a classic that comes to my mind.
http://en.wikipedia.org/wiki/Rule_of_72 http://en.wikipedia.org/wiki/Rule_of_72