Assume you make the following investments: a. You invest a lump sum of $8,550 for four years at 12% interest. What is the investment's value at the end of four years? b. In a different account earning 12% interest, you invest $2,138 at the end of each year for four years. What is the investment's value at the and of four years? c. What generai rule of thumb explains the difforence in the investments' future values? (Click the icon to view the fulure value factor table.) (Click the icon fo view the future value annuity factor table.) (Click the icon to view the present value factor tabie.) (Click the icon to view the present value annulty factor table.) a. You invest a lump sum of $8.550 for four years at 12% interest. What is the investment's value at the end of four years? (Round your answer to the nearest whele dollar) investment's value = Reference Reference Reference Reference