jdii1215 said
Um, RPN calculators enter in Reverse Polish Notation order. Algebraics use parentheses to tell what to calc first or work in entered order.
It is the diff between an old HP or TI calculator and a modern little four function credit card one. TIs usally used RPN. Most scientifics used RPN, less need to automaticly store intermediate results in RAM in calculator so less register RAM needed to calc a function, so cheaper to make.

Had you used 8/9=% or (8/9) % result should have worked right. It is a case of "does function type or strict left to right order" rule.

In this case, it looks like it did the percentage first, and that is RPN rules. Result: 8* .09 or 8*9% or 8/100/9 (<--this is how the calc thunk you wanted it to calc it using RPN rules)==8/11.1111.... ==.72 and thats how it calced it. GROAN.

Algebraic calc would get you percentage last. result .88 converted to % == 88.8888

Windows calc was coded to imitate the scientific Ti's which used RPN when it was first coded-- for Windows 3.11 or before(I saw an early version in a 3.1 OEM). Functions got added, core way of prioritizing never changed. Deliberate, not a bug.

Old-fashioned also, yes. Sorry for the history lesson.

John Danielson