Anushka invested a sum of ¹9,500 at the rate of 20% per annum compound interest, compounded annually. If she received an amount of ¹13,680 after n years, the value of n is:

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?