Compound Interest

What will be the compound interest on a sum of $₹7200$ for $18$ months at a rate of $20\%$ per annum, if the interest is compounded half-yearly (nearest to an integer)?

A principal of $₹2000$ becomes $₹3125$ in a pair of years once combined annually at some rate of interest. what proportion is going to be the quantity if a similar rate of principal was combined half-yearly?

The compound interest (compounded annually) on a certain sum of money at the rate of $20$ p.c.p.a for $2$ years is Rs. $5632$. What is the simple interest on the same sum of money at the rate of $12$ p.c.p.a for $3$ years?

The compound interest on $\mathrm{Rupees} 2000$ for  $1\frac{1}{4}$ years is $10\%$ per annum , the interest being payable quarterly will be:

A person invested $\mathrm{Rs}. 1000$ at S.l. The rate of interest doubles every year with respect to the previous year. In the first year, the rate of interest is $5\%$. In which year, did this person earn $\mathrm{Rs}. 200$ as interest?

A sum triples itself to $Rs. 1,200$ in $4$ years at C.I. If the same sum is deposited for $4$ more years, the C.I. for $8$ years will be _____.

Simple interest on a sum at $4\%$ per annum is $Rs.80$ in $2$ years. The compound interest on the same sum for the same period is:

How much will be the compound interest to be paid on a principal amount of $\mathrm{Rs}.85000$ after $3 \mathrm{years}$ at the rate of $6\% \mathrm{p}.\mathrm{a}.$compounded annually?

A borrowed Rs. $800$ at the rate $6\%$ and B borrowed Rs. $600$ at the rate $10\%$. After how much time will they both have equal debts?

The difference between the compound interest and the simple interest on a sum of money for $2$ years at $12\%$ p.a. is $Rs. 150$. The sum is: