यदि कोई मूलधन साधारण ब्याज पर 3 वर्षों में 18% बढ़ जाता है, तो उसी वार्षिक ब्याज दर पर 25,000 रुपये पर 3 वर्षों में अर्जित चक्रवृद्धि ब्याज (रुपये में) 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.