$A$ deposited $Rs. 6000$ in a bank at $5 \%$ per annum simple interest. $B$ deposited $Rs. 5000$ at $8 \%$ $p.a.$ compound interest. After $2$ years, the difference between their interests (In $Rs.$) will be

What sum of money (In $Rs.$) at compound interest will amount to $Rs. 5305.53$ in $3$ years, if the rate of interest is $1 \%$ for the first year, $2 \%$ for second year and $3 \%$ for the third year?

What would would be the $C.I.$ obtained on an amount of $Rs. 4800$ at the rate of $5$ $p.c.p.a$ for $3$ years (In $Rs.$)?

A sum of money placed at compound interest doubles itself in $4$ $years$. In how many $years$ will it amount to four times itself?

Which of the statement given below are sufficient to answer the following question.

What is the rate of interest per annum on an investment of $Rs. 800 ?$

($I$) The income from $S.I.$ at the end of $3$ years at the same rate of interest is $19$

($II$) $C.I.$ is $15.76$ more than $S.I.$ on same sum $\&$ same rate in $2$ years

The difference between $C.I.$ & $S.I.$ on $Rs. 700$ in $2$ years at $5 \%$ per annum is (In $Rs.$)