Use graphical approximation techniques or an equation solver to approximate the desired interest rate. A person makes annual payments of $1000 into an ordinary annuity. At the end of 5 years, the amount in the annuity is$5875.97. What annual nominal compounding rate has this annuity earned? Use graphical approximation techniques or an equation solver to approximate the desired interest rate. An employee opens a credit union account and deposits $100 at the end of each month. After one year, the account contains $1204.13. What annual nominal rate compounded monthly has the account earned? Use graphical approximation techniques to answer the question. When would an ordinary annuity consisting of quarterly payments of $645.05 at 6% compounded quarterly be worth more than a principal of $4400 invested at 7% simple interest?