रूल ऑफ 72 कैलकुलेटर कैसे काम करता है
The Rule of 72 is a quick mental shortcut: divide 72 by the annual return to estimate how many years it takes to double your money. At 12%, money doubles in about 6 years. The calculator also shows the exact answer using logarithms: ln(2) ÷ ln(1 + r).