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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.
Error 5 indicates that no solution exists. In this particular case, you're asking for the interest rate on a savings account that pays you 10,000 now and an additional 20,000 10 years later. (Or a loan where you pay 10,000 now and an additional 20,000 10 years later.)
Either PV or FV should be negative. For example, if you deposit 10,000 in a savings account and withdraw 20,000 10 years later, use -10,000 for FV.
I get 6.085%. Make sure the fv and pmt are of opposite signs. You're either making annual payments and getting a lump sum back at the end, or receiving annual payments and then paying it all back in a lump at the end. Either way, the money is moving in opposite directions.
My TI-BAII Plus gives the answer as 77,507.
Have you set C/Y & P/Y to 1?
To do this press:
[2ND]
[I/Y]
Then use the [UP] and [DOWN] arrows to check the settings.
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