WELOA.BLL/WEL/LS_incometax.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace LSBLL
{
    public class LS_incometax
    {
        
        public double incometax(string strShouru, string strBaoxian, string strQizheng)
        {
            double num = (double.Parse(strShouru) - double.Parse(strBaoxian)) - double.Parse(strQizheng);
            if (num <= 0.0)
            {
                return 0.0;
            }
            if (num <= 1500.0)
            {
                return (num * 0.03);
            }
            if (num <= 4500.0)
            {
                return ((num * 0.1) - 105.0);
            }
            if (num <= 9000.0)
            {
                return ((num * 0.2) - 555.0);
            }
            if (num <= 35000.0)
            {
                return ((num * 0.25) - 1005.0);
            }
            if (num <= 55000.0)
            {
                return ((num * 0.3) - 2755.0);
            }
            if (num <= 80000.0)
            {
                return ((num * 0.35) - 5505.0);
            }
            return ((num * 0.45) - 13505.0);
        }
    }
}