# gcalctool percents

Asked by Aleksey Kirpichnikov on 2007-12-06

How can i calculate percents?
For Ex. 80 - 20%, 80 + 20% etc.
When I press '%' button it just divides number by 100.
Expected results is 80 - 20% = 64, 80 + 20% = 96

## Question information

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Ubuntu gcalctool Edit question
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Solved by:
Aleksey Kirpichnikov
Solved:
2007-12-06
Last query:
2007-12-06
2007-12-06
 Cesare Tirabassi (norsetto) said on 2007-12-06: #1

As for all scientific calculators, the % sign calculate the percentage (x/100).
If you need to use it for financial calculations, like 80-20% than you need to do it like this:

80*(1-20%) or 80*(1-0.20) or 80*0.8

 Aleksey Kirpichnikov (alexcoder) said on 2007-12-06: #2

Well, i understand that it works, but it's so complex to calculate.
This operations is much easier to calculate on any hardware calc. Even kcalculator can do it easier

 Cesare Tirabassi (norsetto) said on 2007-12-06: #3

Easier for you perhaps, since you are used to financial calculators.
I'm used to scientific calculators and I find 80-20% a non-sense; different people have different views, mine is as good as yours, neither of the two is the right or wrong one.
The authors of gcalctool view it as a scientific calculator, not as a financial one, therefore their choice.

PS. My hardware calculator is actually using RPN, which I find the most easiest and logical mathematical notation for pocket calculators. In this case you need to do: 80 20 % -
Just be glad I'm not the author of gcalculator :-)

 Aleksey Kirpichnikov (alexcoder) said on 2007-12-06: #4

Calculator has four views! So when i use financial view it would be good to calculate as hardware one.
Well, i try to find more simple calc )

 Cesare Tirabassi (norsetto) said on 2007-12-06: #5

bc - The GNU bc arbitrary precision calculator language
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kcalc - calculator for KDE
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apcalc - Arbitrary precision calculator (original name: calc)
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apcalc-dev - Library for arbitrary precision arithmetic
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qalc - Powerful and easy to use command line calculator
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qalculate-gtk - Powerful and easy to use desktop calculator - GTK version
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r-cran-fcalendar - GNU R package for financial engineering -- fCalendar
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snac - complete algebraic calculator for GNOME
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tilp - TI calculator <-> PC communication program for X
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wcalc - A flexible command-line scientific calculator
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xabacus - simulation of the ancient calculator (plain X version)
xmabacus - simulation of the ancient calculator (Motif version)
tiemu - Texas Instruments calculators emulator
gcalctool - A GTK2 desktop calculator
kalgebra-kde4 - mathematical calculator for KDE4

 Aleksey Kirpichnikov (alexcoder) said on 2007-12-06: #6

Thank you very much!

P.S. i bind my Numlock button on keyboard to start calculator, so i need small, fast and with percent calculations one :)