Answer: 15.42%
Explanation: PV ( present value) = $21,320
FV (Future Value) =$ 32.1 million.
Years(y) = 1947-1998 = 51years
r = (FV/PV)^(1/y) - 1
r = ( $32,100,000 / $21,320) ^ ( 1/51) - 1
r = ( $1505.6285)^ ( 0.0196) - 1
r = 1.15421 - 1
r = 0.0154205 X 100%
r = 15.42%
