Compound Interest on Arithmetic Aptitude related Questions and Answers

Question :   The compound interest on a certain sum for 2 years at 10% per annum is Rs. 525. The simple interest on the same sum for double the time at half the rate percent per annum is 1. Rs. 400 2. Rs. 500 3. Rs. 600 4. Rs. 800 Answer :   2 - Rs. 500