The inflation rate is 10% per year and real annual interest rate is also 10% in a bank. if you borrow 100.000 $ for 20 years what will be the amount of payments: a) if it will be paid back with 5 equal installments at the end of each 4 years? b) If the payments in even numbered years is twice of the payments of add numbered yous? (Equal payments in odd years, and equal payments in chen years, first payment is in 2021)