A sum of ₹1000 is invested for 2 years at an interest rate of 10% per year compounded yearly. The principal for the 2nd year is ₹1100.
Calculate the amount on a sum of ₹4000 for 2 years at an interest rate of 10% per annum compounded half-yearly.
A sum of ₹ 100 invested for 3 years at a rate of 20% per annum compounded annually, the principal for the second year is ₹ _______