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 NPer# (rate#, pmt#, pv#, fv#, type%, status%)
 
 Usage Notes
   ■ The argument rate# is the interest rate per period. For example, if you
     get a car loan at a 10% annual interest rate and make monthly payments,
     the rate per period would be .10/12, or .0083.
 
   ■ The pmt# is the payment made each period, and cannot change over the
     life of the annuity. Typically, pmt# contains principal and interest.
 
   ■ The argument pv# is the present value, or lump sum that a series of
     payments to be paid in the future is worth now. For example, when you
     borrow money to buy a car, the loan amount is the present value to the
     lender of the monthly car payments you will make.
 
   ■ The argument fv# is the future value, or cash balance sometime in the
     future after the final payment is made. The future value of a loan, for
     example, is 0. As another example, if you think you will need $50,000 in
     18 years to pay for your child's education, then $50,000 is the future
     value.
 
   ■ The argument status% can be any variable that returns information about
     the success or failure of the calculation. The value of status% will be
     0 if the calculation was successful, and 1 if it was not.
 
   ■ An annuity is a series of constant cash payments made over a continuous
     period of time. An annuity can be a loan (such as a home mortgage), or
     an investment (such as a monthly savings plan).
 
   ■ For all arguments, cash you pay out, such as deposits to savings, is
     represented by negative numbers; cash you receive, such as dividend
     checks, is represented by positive numbers.