In 6 years, you will have $17,109.13 at 6% semiannually compounded.
Plug the values into the following formula: A x [(1 + (R/2))^(N x 2)]. In the formula, "A" represents the initial investment amount, "R" represents the annual interest rate as a decimal and "N" represents the number of years you will own the investment. In this example, the formula would be $20,000 x [(1 + (0.06/2))^(5 x 2)].
