petyaGavrikov

Verified answer

Using System;

class Program
{
public static void Main()
{
double s1,s2;
int k=0;
s1 = 1000;
s2 = 2*s1;
while (s1<s2){
k++;
s1*=1.08;
}
    Console.WriteLine("k = {0}, s1 = {1:f2}", k, s1);
    Console.ReadKey();
}
}

Результат:
k = 10, s1 = 2158.92