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Income Tax Calculator in VB.NET.

DESCRIPTION:
Design a form which has Annual salary with income tax facilities. If monthly salary entered then calculate annual salary. According to this income tax as per below conditions.
Rs.0 - Rs.50000 - No tax
Rs.50000 - Rs.60000 - 10% of annual income
Rs.60000 - Rs.150000 - 20% of annual income
More than Rs.150000 - 30% of annual income
Also print net annual salary after the deduction from tax in label.
PROPERTIES:
Label1
TextEnter Annual Salary
Button1
TextCLEAR
CheckBox1
TextMonthly Salary
CODEING:
Public Class Form1
    Dim i As Single
    Dim s As Double
    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles TextBox1.TextChanged, CheckBox1.CheckedChanged
        If CheckBox1.Checked = True Then
            s = Val(TextBox1.Text) * 12
        Else
            s = Val(TextBox1.Text)
        End If
        If s <= 50000 Then
            Label1.Text = "Net Annual Salary:" & s & vbNewLine & "Income Tax:0" & vbNewLine & "Annual Salary:" & s
        ElseIf s > 50000 And s <= 60000 Then
            i = s * 0.1
            Label1.Text = "Net Annual Salary:" & s - i & vbNewLine & "Income Tax(10%) :" & i & vbNewLine & "Annual Salary:" & s
        ElseIf s > 60000 And s <= 150000 Then
            i = s * 0.2
            Label1.Text = "Net Annual Salary:" & s - i & vbNewLine & "Income Tax(20%) :" & i & vbNewLine & "Annual Salary:" & s
        ElseIf s > 150000 Then
            i = s * 0.3
            Label1.Text = "Net Annual Salary:" & s - i & vbNewLine & "Income Tax(30%) :" & i & vbNewLine & "Annual Salary:" & s
        Else
            Label1.Text = "Enter  Monthly  Salary"
            TextBox1.Text = ""
        End If
    End Sub
    Private Sub Button1_Click_1(sender As Object, e As EventArgs) Handles Button1.Click
        TextBox1.Text = ""
    End Sub
End Class
DESIGNING:

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