Anna inherits inherited money from her great grandparents. She inherits $100,000 from your grandparents, today. She has exactly 20 years to retire and she decided to put the entire amount into 20 years, 4% annual interest annuity.

A) Assume that she did not deposit any additional amount into this account, compute your account balance by the time you retire, using an annuity calculator online. Then, compute the same using a scientific calculator (not a financial one) using the appropriate formulas and show your calculations. (Make sure the amounts are the same!)

B) 1, Now assume that in addition to this initial $100,000, you also contributed $500 at the end of each month until you retire. Compute your retirement account balance using an annuity calculator. Highlight the end balance, total principal, and total interest

2) Now, using relevant formulas and a scientific calculator, reproduce the results (End Balance, Total Principal, Total Interest) showing your calculations. Highlight any issue one has to pay attention to calculating those values.

3) Finally, assume that the contributions were made at the beginning of each month. What are the above three values now? Show your computations to reproduce those values with a scientific calculator and highlight the formulas used.