A person borrowed a certain sum of money at $16\frac{2}{3}\%$ per annum compound interest. He cleared the debt by paying $₹20825$ at the end of $2$ years. Find the sum borrowed.

Note: Round your answer to the nearest $100$.

In how many years will a sum of $₹3200$ compounded quarterly at the rate of $50\%$ per annum amount to $₹4050$?

Ramakrishna borrowed $₹160000$ from Anirudh at $10\%$ per annum simple interest. After $2$ years, when Ramakrishna wans to clear the debt, Anirudh insisted Ramakrishna to pay him at compound interest. How much more must Ramakrishna pay? 

A certain sum triples in $4$ years at compounded interest, interest being compounded annually, In how many years would it become $27$ times itself?

A sum of $₹5120$ amounts to $₹7290$ in $3$ years at compound interest. Find the rate of interest per annum.

The difference between the compound interest and the simple interest on a certain sum of money for $2$ years at $11\%$ per annum is $₹363$. Find the sum. 

A sum of $₹3000$ is partly lent at $3\%$ per annum simple interest for $\frac{7}{2}$ years and partly at $2\%$ per annum simple interest for $4$ years. If total interest earned is $₹280$, then the sum lent at $3\%$ per annum is _____.

Find the simple interest on $₹700$ from $20 dec 2006 to 20 june 2007$ at $6\%$ per annum in $₹$. 

A sum of money triples itself in $3$ years at compound interest in how many years will it become $9$ times itself?