Additional Problems: 1. An annuity-immediate has 20 annual payments starting at 5 and increasing by 10 every year. The annual effective rate of interest is 7%. Calculate the present value of this annuity. 2. An annuity-immediate has 20 semi-annual payments starting at 5 and increasing by 10 every six months. The annual effective rate of interest is 7%. Calculate the present value of this annuity. A loan is to be repaid with 20 payments starting in one year. The first ten payments are 1500 and the each of the next ten payments decrease by 100. The annual effective rate of interest is 7%. Calculate original loan balance. 4. Jason makes 15 annual deposits starting today. His first payment is 600 and each subsequent payment increases by 10%. One year after the last deposit is made he buys a 15-year annuity-due with annual payments of X. The annual effective interest rate of 5%. Calculate X