My BA II plus professional showing wrong answer while computing "N" during TVM calculation

Download the Guide of Calculator form Texas Instruments official website BA II PLUS™ Guidebook - Texas Instruments - US and Canada (ti.com) and refer to page 82 (Reference Information)

You need to clear the worksheets before using the stats again, or you will have junk stored in the variables.

Were you also clearing the financial memory with 2nd [CLR TVM], or just the storage memory? If you don't, it's going to keep using whatever value you last used for PMT.

It's a little tough to diagnose with what you've given. Could you post all the numbers you're putting in, the result you're getting, and the result you expect?

The 107,186.37 is what the future value would be if the interest per month is 0.58%, which is 6.96% per year. Try the following:
2nd [CLR TVM] 1 2 N 7 I/YR 1 0 0 0 0 0 PV CPT FV
As for rounding, you can change the calculator display to any number of digits (up to a limit, of course) by pressing 2nd [FORMAT] and then a number specifying the number of desired digits after the decimal point or 9 for floating decimal.

I would suggest changing back to the old batteries

2nd [CLR TVM] (clear TVM registers)

2 4 0 0 +/- PV ($2400 initial investment, negative because you're paying it out)

6 I/Y (6% annual interest)

1 N (one year)

CPT FV (compute future value, see 2544.00, the value after one year)

5 N (five years)

CPT FV (see 3211.74, the value after five years)

1 0 N (ten years)

CPT FV (see 4298.03, the value after ten years)

Error 5 indicates one of two conditions while doing a TVM calculation.

1) You tried to compute the interest rate when FV, PV, and PMT all have the same sign. Make sure cash inflows are positive and outflows are negative.

2) The LN input is not greater than zero during calculations.

The first is much more likely.

It's more common that one of the settings is not correct. Check the BEGIN/END setting, the number of payments per year, and the number of compounding periods per year.

If you still have problems, please give an example of a TVM problem, with your results and the correct result. Simply saying "incorrect results" doesn't let anyone help you.

Before each calculation of a TVM problem you must fully clear the calculator ... Press [2ND] [CPT] [2ND] [FV]

Best of luck