What is the rate of interest p.c.p.a.?

I. An amount doubles itself in 5 years on simple interest.

II. Difference between the compound interest and the simple interest earned on a certain amount in 2 years is Rs. 400.

III. Simple interest earned per annum is Rs. 2000

The difference between compound interest and simple interest on a certain sum of money for 2 years at 5% per annum is Rs. 41. What is the sum of money?

The compound interest on Rs. 24000 at 10% per annum for 11⁄2 years, interest being compounded semi­annually is

What would be the compound interest of Rs. 25000 for 2 yrs. at 5% per annum?

If compound interest received on a certain amount in the 2nd year is Rs 1200, what will be the compound interest (in Rs) for the 4th year on the same amount at 10% rate of interest?

The compound interest earned in two years at 15% per annum is Rs 20640. What is the sum invested (in Rs)?

In what time(in years) will Rs. 8000 amount to Rs. 9261 at 5% per annum, compounded annually?

If the difference between the compound interest and the simple interest on a certain sum at the rate of 5% per annum for 2 years is Rs. 20, then the sum is

The amount received at 10% per annum Compound interest after 3 yrs is Rs 5324. What was the principal (in Rs)?