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The calculator is set to handle payments at the beginning of the period instead of at the end. To switch to the end mode, press g END (END is the g-shifted function of the 8 key).
Press f ALG. ALG is the f-shifted function of the EEX key, just above the double-size ENTER key. This will switch the 12C Platinum from RPN mode to Algebraic mode, and ALG indicator will light up instead of the RPN indicator.
To switch back to RPN, press f RPN. RPN is the f-shifted function of the CHS key just above the EEX key.
If you're seeing a "C" on the display, it means the calculator is set to use compound interest for the odd period. To switch to using simple interest, press STO followed by EEX.
Assuming you have a 12C Platinum, press f [RPN] to switch from the algebraic to the RPN mode. [RPN] is the shifted function of the CHS key on the top row of the keyboard.
The EEX key is used to enter the exponent of a power of 10. To raise e (the base of natural logarithms) to a power (exponentiation) press [g][e^x]: You enter a number (the exponent) then [g][e^x] and the result will be displayed.
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