Return the rate of return r on an investment of present value v which pays p in n consecutive periods.
The optional argument l may be used to specify an additional lump-sum payment made at the end of n periods.
The optional string argument method may be used to specify
whether payments are made at the end ("e"
, default) or at the
beginning ("b"
) of each period.
See also: pv, pmt, nper, npv.
Package: financial