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a. What is the future value of an initial $5000 after 10 years at 6% annual interest rate? b. Find the future value of the ordinary annuity with payment of $500 per year for 20 years at 6% annual interest rate. c. Find the present value of the ordinary annuity with payment of $500 per year for 20 years at 6% annual interest rate. d. If your investment grows at 10% per year, how many years will take before this investment grows three times? e. What interest rate would cause $1000 to grow to $3000 in 10 years