Amount = P[tex] (1+ \frac{r}{n}) ^{nt} [/tex]
P is the amount you invested.
r is the interest rate in decimal form (so 6% = 0.06)
n is the number of times a year you are paid interest (semiannually = 2)
nt is the number of payment times you expected (4 years, twice a year = 8 times)
