double value = Convert.ToDouble(s);
double onePercent = value / 100;
value = value + onePercent * 10;
return value.ToString();
int arrayA[] = new int[5] { 200, 600, 1000, 1400, 2000 };
double arrayB[] = new double[5] { .3, .25, .2, .15, .1 };
for (int a = 0; a < arrayA.Length; ++a)
if (value == arrayA[a])
{
value += value * arrayB[a];
break;
}