Ako se nisam negdje zeznuo onda je ovo:
Code:
using System;
using System.Collections.Generic;
using System.Text;

namespace Zadatak
{
    class Program
    {
        static void Main(string[] args)
        {
            double n1 = 30000, n2 = 30000;
            double r = 0.085;
            int i;
            n1 = n1 * Math.Pow((r+1), 17);
            for (i=0; ;i++) {
                n2 = n2 * ((r / 12)+1);
                if (n2 >= n1) break;
            }
            int g = i / 12;
            int m = i - 12 * g;
            Console.WriteLine(g+" godina i "+m+" mjeseca");
        }
    }
}