Hi Chuck,

>
>This website had a function to solve for a var. Using the equation I gave you before it could solve every thing exect for the interestrate.
>
>http://www.hostsrv.com/webmab/app1/MSP/quickmath/02/pageGenerate?site=quickmath&s1=equations&s2=solve&s3=basic
>
>So you can look at the other equations to see if it helps or you could create a loop and loop though posible interest rates util you find a match. Something like FOR i = 0 TO 1 STEP .005
>

I ended up iterating through the possible rates like you suggested. I guess that is the only way to get the answer. My code looks something like this:

For lnIntRate = 0 to 1 Step .000001
	If Payment(lnAmtFinan, lnIntRate, lnNumPayments) >= lnPayment
		Exit
	EndIf 
EndFor 

Return lnIntRate

Not the fastest piece of code in the world, but it works. Thanks.