the requirements for each of the following separate cases. Case 1 . On January 1 of the current year, Joy Brown deposited $20,000 in an investment account that would accumulate at 11% annual compound interest for four years. Required Compute the investment account balance at the end of the fourth year. Case 2 . On March 1 of the current year, Phil Gray deposited $15,000 in an investment account that would ac- cumulate to $16,873 at the end of three years, assuming annual compound interest. Required Compute the expected interest rate in this case. Case 3 . On September 1 of the current year, Dan Jones deposited