Returns the future value of an investment based on periodic, constant payments and a constant interest rate.
 | rate | is the interest rate per period. |
| Nper | is the total number of payment periods in an annuity. |
| Pmt | is the payment made each period; it cannot change over the life of the annuity. Typically, pmt contains principal and interest but no other fees or taxes. |
 | Pv | is the present value, or the lump-sum amount that a series of future payments is worth right now. |
| Type | is the number 0 or 1 and indicates when payments are due. If type is omitted, it is assumed to be 0.Set type equal to: 0 = At the end of the period; 1 = At the beginning of the period |
