यदि ब्याज वार्षिक रूप से संयोजित होता है, तो 512 रुपये की राशि 3 वर्षों में किस वार्षिक प्रतिशत दर पर 729 रुपये हो जाएगी?

A person invested Rs. 2,000 in a bank at a rate of 5% per annum for 2 years. What is the compound interest he will get?

What is the compound interest (in ₹) on a sum of ₹18,000 at 20% per annum for 234 years, compounded annually?