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Financial Module (Visual Basic) 

The Financial module contains procedures used to perform financial operations.

This module supports the Visual Basic run-time library members that perform financial calculations such as depreciation, present and future values, interest rates, rates of return, and payments.

This example uses the Rate function to calculate the interest rate of a loan, given the total number of payments (TotPmts), the amount of the loan payment (Payment), the present value or principal of the loan (PVal), the future value of the loan (FVal), a number that indicates whether the payment is due at the beginning or end of the payment period (PayType), and an approximation of the expected interest rate (Guess).

Sub TestRate()
    Dim PVal, Payment, TotPmts, APR As Double
    Dim PayType As DueDate

    ' Define percentage format.
    Dim Fmt As String = "##0.00"
    Dim Response As MsgBoxResult
    ' Usually 0 for a loan.
    Dim FVal As Double = 0
    ' Guess of 10 percent.
    Dim Guess As Double = 0.1
    PVal = CDbl(InputBox("How much did you borrow?"))
    Payment = CDbl(InputBox("What's your monthly payment?"))
    TotPmts = CDbl(InputBox("How many monthly payments do you have to make?"))
    Response = MsgBox("Do you make payments at the end of the month?", MsgBoxStyle.YesNo)
    If Response = MsgBoxResult.No Then
        PayType = DueDate.BegOfPeriod
        PayType = DueDate.EndOfPeriod
    End If
    APR = (Rate(TotPmts, -Payment, PVal, FVal, PayType, Guess) * 12) * 100

    MsgBox("Your interest rate is " & Format(CInt(APR), Fmt) & " percent.")
End Sub