A sum triple itself in 9 years at simple interest. Find the rate of interest per annum is.

Answer the following questions

At a simple interest Rs. 3050 becomes Rs. 4026 in four years. If the interest rate was increased by 4% how much would Rs.7500 become in four years ?

The difference between the simple interest and the compound interest on a certain amount at 5% for two years is 25, what is the amount?

What sum will amount to ₹ 7000 in 5 years at simple interest ? 

Alipta got some amount of money from her father. In how many years will the ratio of the money and the interest obtained from it be 10:3 at the rate of 6% simple interest per annum?

 If 64 amount to 83.20 in 2 years what will ₹ 86 amount to in 4 years at the same rate percent per annum? 

A person deposited ₹15,600 in a fixed deposit at 10% per annum simple interest. After every second year he adds his interest earned to the principal. The interest at the end of 4 years is:

The total sum of amounts of A and B at the end of 4 years and 2 years respectively on the same principal is Rs. 20,020. If A is charged Simple interest at the rate 10% and B is charged Compound interest at the rate 5%. The principal is?