I Will Teach You to Be Rich: No Guilt. No Excuses. No B.S. Just a 6-Week Program That Works.

by Ramit Sethi

Divide the number 72 by the return rate you’re getting, and you’ll have the number of years you must invest in order to double your money. (For the math geeks among us, here’s the equation: 72 ÷ return rate = number of years.)