Rule 72 was discovered by Albert Einstein and he considered it his greatest discovery, the E= MC2 ( Squared). You may have applied this. This is the best way to acquire wealth. You will know when your money doubles. Just take the number 72 and divide it by the interest rate you have to earn. That number gives you the approximate number of years it will take for your investment to double. The bank can't make it, only in your business. Try this Rule 72 and make an estimation of when you will become wealthy.