Easy Overtime Calculation Not Working for Me?

[j0hnx777]

Hi, I am trying to get this pay rate calculator to work. The language is visual basic, but the problem I think is either the way I set it up and/or the arithmatic. It should calculate the number of hours times the pay rate of an employee. It should also calculate overtime if an employee has worked over 40 hours that they should be paid time and a half. For some reason, the calculation is wrong and I can't figure it out. If I put the pay rate was $10 and the hours were 41, I get an answer of $425. The result should be $415. I would appreciate any help. Not sure what's happening here but here is my code

Public Class Form1
    Private Sub calc_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles calc.Click
        Dim number1 As Integer
        Dim number2 As Integer
        Dim overtime As Integer
        Dim total As Integer
        number1 = TextBox1.Text
        number2 = TextBox2.Text
        total = number1 * number2
        overtime = ((number1 - 40) * (number2 * 1.5)) + total
        If number1 > 40 Then
            result.Text = "Your total pay is " & overtime
        End If
        If number1 <= 40 Then
            result.Text = "Your total pay is " & total
        End If
    End Sub
End Class

[nojtb]

        number1 = 41
        number2 = 10
        total = 41 * 10 //410
        overtime = ((41 - 40) * (10* 1.5)) + total // 1 * 15 + 410 = 425