Please show formula

c-How much must one invest now (PV) to have $20,000 3 years from now, assuming one could earn 12% per year d. What is the present value of $20,000 received 3 years from now, assuming one could earn 12% per year e. What is the present value of $20,000 received at the end of each of the next two years, assuming an interest rate of 12% f. What is the present value of $20,000 received at the end of each the next three years plus $100,000 received at the end of the third year. Assume an interest rate of 12%. A= $119,215 FV / (1+i)^n = PV FV 20,000 20,000 20,000 100,000 Periods of int 1.120 1.254 1405 1405 PV 17,857 15,944 14,236 71,178 19