A sum of Rs.1728 becomes Rs.3375 in 3 years at compound interest, compound annually. Find the rate of interest.

What will $₹40,000$ amount to in $2$ years at the rate of $20\%$ p.a., if interest is compounded yearly?

A sum of $₹ 2500$ becomes $₹ 8100$ in $2$ years at a certain rate of compound interest. What will be the sum (in $₹$) after $4$ years?

What will be the compound interest on a sum of Rs. 160000 for 2 years at the annual rate of 10%, if the interest is compounded half yearly?

On a certain principal, simple interest amounts to Rs. 1000 in 1 year at the rate of 10% p.a. What will be the effective rate of interest if the same is compounded on a half-yearly basis?

1. 10.10
2. 10.15
3. 10.20
4. 10.25

Kamal’s salary in 2011 was Rs. 30000 per annum. If his salary increases by 5% per annum, what was his salary in the year 2013? 

(A) Rs. 34,728.75 

(B) Rs. 35,000 

(C) Rs. 31,500 

(D) Rs. 33,075