1.8 Grace will be investing an amount of R4 000 annually at the beginning of each of the following four years. She will earn a compounded interest of 6% per annum. Calculate the future value of Grace's investment, using your financial calculator [Use four decimal places for your calculations and round your final answer to the nearest rand. Choose the alternative closest to your answer if you do not arrive at the exact alternative due to rounding differences.] a) R17 498 b) R13 860 c) R14 692 d) R18 548 12