HP 50g Graphing Calculator - Manual (Page 237)

Page 6-31
Press J to exit the SOLVR environment. Find your way back to the TVM sub-
menu within the SOLVE sub-menu to try the other functions available.
Function TVMROOT
This function requires as argument the name of one of the variables in the TVM
problem. The function returns the solution for that variable, given that the other
variables exist and have values stored previously. For example, having solved a
TVM problem above, we can solve for, say, ‘N’, as follows: [ ‘ ] ~n`
@TVMRO. The result is 10.
Function AMORT
This function takes a value representing a period of payment (between 0 and n)
and returns the principal, interest, and balance for the values currently stored in
the TVM variables. For example, with the data used earlier, if we activate
function AMORT for a value of 10, we get:
Function BEG
If selected, the TMV calculations use payments at the beginning of each period.
If deselected, the TMV calculations use payments at the end of each period.