Calculator Question - Posted by Greg A

Posted by John Behle on October 25, 1998 at 10:32:48:

What I was referring to was the menus and keystrokes that are different. I’ve taught thousands how to use just about every calculator available. It took about 5 minutes for me to change my 19b to RPN and it’s been that way ever since. A side benefit is my wife doesn’t like it that way, so she doesn’t borrow my calculator!

I just totally prefer the 19B, so I’m not even sure where my 10B is (probably my wife’s briefcase). I don’t know the menus well enough on that calculator to give exact keysrokes. I’m still amazed the CCIM courses chose the 10B as the standard calculator instead of stepping up to the 17 or 19 for a few dollars more. It’s a hardy calculator two. We had a fire totally destroy our office building in 1991 and the two things that survived were my HP19b and my Timex watch. Takes a licking and keeps on ticking.

Calculator Question - Posted by Greg A

Posted by Greg A on October 23, 1998 at 23:50:21:

I’m using (actually trying to use) an HP 10B and am have problems. Using the following:

Original Amount: $25,000
Ten Percent (10%) Interest
Amortized Over 15 Years
Monthly Payment: $268.65
18 Payments Made - 162 Remain
Present Balance: $23,833

  1. What am I not doing to figure yield properly? I thought I use the following, but I’m having trouble when Nj is more than 2 digits. The following shows what I’m doing:

'Clear All’
12 'P/YR’
23833 ‘+/-’ ‘CFj’ = CF0
268.65 ‘CFj’ = CF1
162 ‘Nj’ = Receiving “Error - PEr” instead of N1

When Nj is

Try the BA-35 Solar - Posted by Mr Donald (NORVA)

Posted by Mr Donald (NORVA) on October 24, 1998 at 06:05:37:

For your problem, you ought to rush out to your local office supply store and pick up the TI-BA 35 Solar calculator, and save yourself a lot of headaches in the future - such as new batteries, and so forth. Cost: $25 or so. Great for basic RE - why pay more?

I= 10% per annum (or 0.83333 per month)
N=180 months
Calculate for PMT to verify your input and it should equal

Then change
and calculate for FV which should now equal

So for
Entering I=20% per annum (1.66666667 per month)
Calculate for PV which should equal

For just over $15,000, your yield on the remaining payments is 20%.

Use The HP 10B, If That’s What You Have - Posted by Marvin Seawood

Posted by Marvin Seawood on October 24, 1998 at 01:00:24:

Hi Greg,

Offer $15,000.

I’ll start with your second question; Your calculator
has the following 5 function values stored:

N = 162
I/YR = 10
PV = 23,834
PMT = 268.65
FV = 0

To find out what the value of this cashflow would be to
yield 20%, press;


Don’t really understand item number one - the CFj’s
(and Nj’s) are used to analyze uneven cashflows - and
(with the HP 10B) you can enter only one year of data
(if your payment period is one month). Which reminds
me - ‘12 P/YR’ (the step after ‘Clear All’) is unneces-
sary; the calculator retains that information. The only
times I have had to use that function is when I was
playing around.

Now Greg, you buy the note for $15,000 and the payee
refinances after six additional (two years total)
payments; What will be your yield?


Re: Calculator Question - Posted by John Behle

Posted by John Behle on October 24, 1998 at 24:30:34:

I’ll start looking for my 10B. I use a 19B and a 12C, which function totally different. I haven’t used the 10B in a while, so maybe someone else has one handy. I’ll look for it.

Re: Use The HP 10B, If That’s What You Have - Posted by Greg A

Posted by Greg A on October 24, 1998 at 10:31:22:


I cann’t thank you enough! You turned the light on for me! I was obviously making this too complicated.

In answer to your “challenge”:

“…you buy the note for $15,000 and the payee
refinances after six additional (two years total)
payments; What will be your yield?”

I came up with 94.7%. I arrived at this by plugging in the following:

N = 156
I/YR = 10
PMT = 268.65
FV = 0
This gave me a PV of 23,404.67

I then plugged in:

CF0 = -15,000
CF1 = 268.65
N1 = 6
CF2 = 23,404.67
This gave me an IRR/YR of 94.68

Is this correct or am I still stumbling in the dark?

Greg Adams
Omaha, Nebraska

Re: Calculator Question - Posted by Eduardo (OR)

Posted by Eduardo (OR) on October 24, 1998 at 18:23:14:


If perhaps you mean by “function totally differently,” that 12C uses RPN and 19BII uses algebraic, see Appendix D in 19BII owner’s manual for how to select EITHER algebraic or RPN mode (page 315). I hope it’s the same for 19B, if this is what you have. And, I hope this is what you meant and this info is useful to you. (I use 12C in the field and sometimes check my work on the 19BII in RPN mode–no problem switching back and forth.) --Eduardo