A sum of money at Simple Interest amounts to Rs.815 in 3 years and Rs.854 in 4 years. What is the sum?

The simple interest on a principal amount (in Rs. ) is Rs. 576 for a period of 3 years at the rate of 6% per annum. The principal amount (in Rs. ) is:

Find the simple interest (in Rs.) on Rs. 4,000 at 7.5% per annum rate of interest deposited on 3 February 2024 and withdrawn on 4 April 2024.

Sapna invested Rs. 20,700 on simple interest, partly at 9% per annum and partly at 14% per annum. If she earns equal interests from the two investments after 3 years, then find the sum invested at 9% per annum (in Rs.).

A man invested 3400 in simple interest at 12% p.a. for (x+1) years. If the interest received by him is 3/5th the amount invested, then find x.