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- HP 12 c Platinum - RPN

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01-26-2017 12:28 PM
I am a Realtor and used the calculator for a long time since 1990. I never noticed the RPN in the Mantel.
In the meantime, Im having problems with simple additions or substractions. I put the first figure then ENTER and when I go tothe second figure is recorder next to the one. In other words the ENTER key does not seem to work until a pressed it several times.
Does the RPN in the mantel has something to do with this? Please advise. THANKS!

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