Use math functions : Math Functions « Development « Java Tutorial

1. Java Tutorial
2. Development
3. Math Functions

public class MainClass {
  public static void main(String args[]) {
    double loanAmount = 0;
    double top = 2 * 5 / 1200;
    double bot = 1 - Math.exp(5 * (-12) * Math.log(1 + 7 / 1200));

    System.out.println(loanAmount);
    System.out.println(top);
    System.out.println(bot);
  }
}