How to calculate interest rate based on original balance and payment amount using BA II Plus

Enter the number of months, press N. Enter the annual interest rate, press I/Y. Enter the amount of the loan, press PV. Press CPT then PMT to calculate the amount of the monthly payment.

Full details, as well as how to do other types of calculations, are in the manual.

That depends on the interest rate.

2nd [CLR TVM] (clear previous data)
5 0 0 0 PMT (monthly payment)
2 0 2nd [*P/Y] N (20 years of monthly payments)
annual interest rate I/Y (annual interest rate)
CPT PV (compute present value)

At 10% it's about $518,000

2nd [CLR TVM] (clears any previous results)

4 I/Y (4% interest rate)

1 2 0 0 +/- ($1200 monthly payment, negative because you're paying out the amount)

2 5 0 0 0 FV (desired value, positive because you'll be receiving the amount)

CPT N (compute the number of payments)

I just took the battery out and it reset itself.

100000+8%= Divide by 360

set your p/y to 12( compounding periods per year). I think you are calculating for a one year loan?

what numbers are you putting in? For example, I just plugged in
N=360 (12m/30y)
I/Y = .5833 (7/12m)
PV = 200000
FV = 0 (it will be paid off)
PMT = 1,330.6050
The only thing I could offer is that perhaps you forgot to enter one of the variables...?

Are you putting 30x12=360 for N? Since you have monthly payments, you have to compute it a little different. Also, you have to find the effective monthly interest rate. 1.0575^(1/12) = .4669839%.

Another way is to enter 30 for N and 5.57 for I/Y, and change P/Y to 12.

Hope this helps!

I gave up using the Texas BA II. I used an on-line mortgage calculator for interest only. I was able to get a full printout.
I would like to learn more about the BA II and how to do this type of math on it.
Thank you

Clear calc and mode registers & select two decimal places- ON/C, 2nd, CMR,FIX,2
Select FIN Mode - 2nd, FIN repeat until FIN shows up in display
Enter months in mortgage - N
Divide annual interest rate by 12 - Enter result as %i
Subtract down payment from cost of home - Enter result as PV
Compute monthly payment - 2nd, PMT
for Payments at beginning of month , press DUE, PMT

I have a question for you, what battery does the TI BA-II Constant Memory calculaor use?

Much thanks.

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