कितने वर्षों में 2000 रुपये की धनराशि 10% वार्षिक चक्रवृद्धि ब्याज की दर से 2420 रुपये हो जाएगी, जबकि ब्याज वार्षिक रूप से संयोजित होता है?

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?