using System;
 
public class Test
{
	public static void Main()
	{
		for (decimal x = 1 ; x != 2 ; x+=0.01M) {
			decimal y = CashRound(x);
			Console.WriteLine("{0:0.00} {1:0.00}", x, y);
		}
	}
 
    public static decimal CashRound(decimal value, decimal cents = 0.05m, decimal down = 0.03m, decimal up = 0.08m)
    {
      var roundedValue = Math.Truncate(value * 100) / 100; // ensure internal value has 2 decimals
 
      var modToCents = roundedValue * 100 % (cents * 100);
      if (modToCents == 0)
        return roundedValue;
      else if (modToCents < down * 100)
        roundedValue -= modToCents / 100;
      else if (modToCents < up * 100)
        roundedValue += cents - modToCents / 100;
      else
        roundedValue += modToCents / 100;
 
      return roundedValue;
    }
 
}

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