Rate

The Rate function returns the interest rate per period for an annunity.

Usage:

	= Rate(<nper>,<pmt>,<pv>,[<fv>],[<type>],[<guess>]);

Nper is total number of payment periods in an annuity.

Pmt is the payment made each period and cannot change over the life of the annuity.

Pv is the present value -- the total amount that a series of future payments is worth now.

Fv is the future value you want to attain after the last payment is made. Fv is optional and assumed to be 0 if omitted.

Type is the number 0 or 1 and indicates when the payments are due. Type is optional and assumed to be 0 if omitted. 0 is for the end of the period. 1 is for the beginning of the period.

Guess is your guess at what the rate will be. Guess is optional and assumed to be 10% if omitted.

Example:

	/* returns 0.0077 */
	= Fixed(Rate(48, -200, 8000), 4)