Let us write by calculating the number of years for which an amount becomes twice of its principal having the rate of simple interest of 6% per annum

Let Principal (P) = ₹ x

Rate (r) = 6%

Simple Interest (I) = ₹ x

time (t) =?

time = \frac{\text { Interest } \times 100}{\text { Principal } \times \text { Rate }} \\

time = \frac{x \times 100}{x \times 6}=16 \frac{2}{3} \mathrm{yrs} \\

∴ time = 16 \frac{2}{3} \mathrm{yrs}