However, for the second year, the total deposits and earnings would be $2,100 dollars, with a deposit earning interest rate earnings of $100 dollars. Now the new total is reinvested, thus earning compound interest. Looking at the table for the third year, you can see a total deposit and earnings of $3,310 dollars. The result is a profit of $310 dollars at the end of the three-year period. The rule of 72 is very simple to explain. The rule of 72 is a calculation that helps you discover the time period in which someone can expect to double their investment. To find out, divide 72 by the interest rate. For example, if you deposit $10,000 with an interest of 6% per annum. You should wait 12 years for your money to double, i.e. 72/6= 12. In conclusion, you realized that if you ask the question again whether to get the money now or later, the obvious answer should be now. Just because you could invest this money and earn interest on it. Furthermore, the process of analyzing different investment activities. Investing for a single period, multiple periods. Invest in payment options or annuities. And the rule of 72; they all only solidified the truth of Benjamin Franklin's famous quote: "Remember that time is money."