4. Find the present value of an ordinary annuity of $100 per year for 30 years assuming an interest rate of 8%? For this one simply use the PV function and put in the necessary inputs. There is no future value in this case and you can omit the type as that is asking whether it is an annuity due or an ordinary annuity. Since it is an ordinary annuity with the payments coming at the end of each year you could put 0 (you would use lif it was an annuity due) or you can simply leave it blank as Excel then defaults to an ordinary annuity