The appropriate formula is A = P(1 +r/n)^(nt) where P is the amount invested (720) r is the annual interest rate (0.062) n is the number of compoundings per year (2) t is the number of years (5)
Filling in the given numbers, you have A = $720·(1 + .062/2)^(2·5) A = $720·1.031^10 A ≈ $977