एक धनराशि वार्षिक रूप से संयोजित 20% प्रति वर्ष की दर से 2 वर्षों में 3790 रुपये हो जाती है। वह मूलधन ज्ञात कीजिए।

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?