In certain years a sum of money is doubled itself at $6 \frac{1}{4} \%$ simple interest per annum, then the required time (In $years$) will be
$12.5$
$8$
$25$
$16$
A sum of money at compound interest amounts in two years to Rs. $2809,$ and in three years to $Rs. 2977.54 .$ Find the rate of interest and the original sum.
A sum of money invested at compound interest amounts to ₹ $800$ in $3$ years and to ₹ $840$ in 4 years. The rate of interest (In $\%$) per annum is
Find the least number of complete years in which a sum of $Rs. 1500$ at $25 \%$ compound interest will be more than double.
The compound interest (In ₹) on ₹ $12000$ for $9$ months at $20 \%$ per annum, interest being compounded quarterly, is
The difference between simple and compound interest compounded annually on a certain sum of money for $2$ years at $4 \%$ per annum is $Rs. 1$ The sum (in $Rs.$) is