13 steps  listing included...don't read unless you want to see it! Message #3 Posted by Gene on 5 July 2002, 4:58 p.m., in response to message #2 by thibaut.be
Ok, to make up for NOT READING the earlier challenge completely (I used a numeric key), I have a 41c style solution with 13 steps, including LBL and RTN.
My inputs are n, PV, and i in the Z, Y, and X registers. I assumed that n is total number of payments and i was the periodic interest rate...if the payments are monthly then i is the monthly interest rate.
Interestingly, I have 15 step solutions for PV, n, i and PV, i, n as the input order.
LBL 01
x
Lastx
1
+
RUP (Roll Up)
CHS
Y^x
1

CHS
Divide
RTN
That seems to work. Anyone less than 13?
Gene
