चक्रवृद्धि ब्याज (वार्षिक रूप से संयोजित) पर निवेश की गई एक राशि 2 वर्ष में ₹12,300.80 हो जाती है। यदि ब्याज की दर 24% प्रति वर्ष है, तो मूलधन कितना 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?