एक निश्चित धनराशि पर 5% वार्षिक दर से 2 वर्ष का साधारण ब्याज 1600 रुपये है। उसी धनराशि पर 5% वार्षिक दर से 3 वर्ष के बाद का चक्रवृद्वि ब्याज (ब्याज वार्षिक रूप से संयोजित) कितना होगा?

The difference between simple interest and compound interest (compounded half-yearly) on a sum at the rate of 25% per annum for 1 year is ₹ 4,375. What is the principal amount?

A person invested half of his capital at 10% simple interest and the other half at 10% compound interest (compounded annually) for 2 years. If the total interest earned is ₹ 4,100, find his total capital.