The Rule of 72 is a useful way to measure how long your investment will take to double, given a fixed annual rate of return. Dividing 72 by the annual rate of return gives you the number of years it'll take for the initial sum to double. For instance, an annual rate of return of six per cent means it will take 12 years for your investment to double (assuming all other things being equal or ceteris paribus). #Investing101 is brought to you by UOB Asset Management and Investment Management Associa