Consider a deposit of $116 placed in an account for 20 years at r% compounded continuously. Use a graphing utility to graph the exponential functions describing the growth of the investment over the 20 years for the following interest rates. Compare the ending balances A for the three rates. (Round your answers to two decimal places.)
(a) r=3% A=$___
(b) r=5% A=$___
(c) r=7% A=$___