Not sure if I posted in the right board, this is a college algebra class. I'm using the compound interest formula A = P(1+r/n)^nt here is my problem. 1400 = 1000(1 + (r/360))^720 I come up with 720 because t is 2 years. Now I've divided both sides by 1000 and I get 1.4 = (1 + (r/360))^720 if I take the reciprocal of the exponent 720 and multiply it by both sides I get 1.4^(1/720) = 1 + (r/360) .. question is where do I go from here?