How can I program my TI BAII Plus to calculate monthly payments on a 365/360 basis

For a thirty-year, $100,000 mortgage at 8% annually, compute the monthly payment:

2nd [CLR TVM] ( clear the time value of money registers )
3 0 * 1 2 N ( thirty years at twelve payments per year )
8 I/Y ( 8% annual interest )
1 0 0 0 0 0 PV ( $100,000 mortgage )
CPT PMT ( compute payment )

You should see -733.76. The negative indicates payment, the amount is $733.76.

Press 2nd [BGN] 2nd [SET]. Each press of 2nd [SET] toggles between BGN and END. Press 2nd [QUIT] when done.

You can download the manual from the manufacturer's web site at
http://education.ti.com/calculators/downloads/US/Guidebooks/Detail?id=6114

If $100,000.00 loan: enter 100000. in pv, if interest rate is 5%, enter 5 divided by 12 = %i if 30 year mortgage, enter 360 N enter 2nd PMT to get monthly principle and interest. You may have already solved this problem.

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)

100000+8%= Divide by 360

No. To the nearest cent, the monthly interest is $162.50. The monthly payments only pay the interest, without reducing the principal.

See this handy Texas Instrument guide on calculating different formulae.
http://www.retrevo.com/support/TI-BA-II-PLUS-PROFESSIONAL-Calculators-manual/id/421ci277/t/2/

Check to make sure you have the proper value set for payments-per-year.

http://education.ti.com/educationportal/downloadcenter/SoftwareDetail.do?website=US&tabId=2&appId=6114