We'll say principal = 100 and total = 200 a) exp = log(total / principal) / (n* years) where "n" is the number of compounding periods per year exp = log (200 / 100) / (4*6) exp = log (2) / (24) exp = 0.30102999566 / 24 exp =
0.0125429165
b) rate = (10^exp -1) * n rate = (10^0.0125429165 -1) * n rate =
(1.0293022367
-1) * n rate = .0293022367 * 4 rate =
0.1172089468
rate = 11.72089468 %
