Write a present value calculator subroutine similar to the one which appears in section 38.4. However?as illustrated below?your subroutine should ask the user for the cash flow value, the interest rate, and the number of periods. It should then display the result in a message box. Sensible default values should be supplied for all arguments. Do not use the Excel function PV ; write your own present value function and use it. A reminder:

You can use the PV function provided by Excel, as we did, to verify the correctness of your subroutine.

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CF PV(CF, r, n)= E; 5(1+r)' i=1