topic Stock calculator giving wrong mean of numbers in Z Series

Calculator it's wrong

Maksim91k — Fri, 01 Apr 2016 11:33:53 GMT

Calculator it's wrong, I put "100-20%" and the results is 99.8
I download the original Google calculator (it's exactly same) but 100-20% is 80

Re: Calculator it's wrong

MarlonUk1 — Fri, 01 Apr 2016 11:41:44 GMT

did you change the calculator mode? i am not much of an math expert but changing the mode to RAD INV or DEG have different answer to complicated probs

Re: Calculator it's wrong

Maksim91k — Fri, 01 Apr 2016 11:42:50 GMT

I have tried everything but same results. 😞

Re: Calculator it's wrong

MarlonUk1 — Fri, 01 Apr 2016 11:49:54 GMT

well apparently mine says the same as yours, it might be it uses different way of stating the problem or it is just faulty.

Re: Calculator it's wrong

Uliwooly — Fri, 01 Apr 2016 15:02:16 GMT

@Maksim91k

It should be 80, I get 80 on all calculators, which makes sense

100-20% = 100 - [(100*20)/100] = 80

Re: Calculator it's wrong

_alexdon_ — Fri, 01 Apr 2016 15:24:47 GMT

@Maksim91k The xperia calculator seems correct to me. 100 - 20% = 99.8.

20/100 = 0.2. You didn't specify anywhere that it is 20% of 100. Just try to use the google calculator and type in 100-20%*100.

It will give you the same result as the first 100 - 20%. Google calculator is wrong or not correctly set up.

Re: Calculator it's wrong

Maksim91k — Fri, 01 Apr 2016 15:35:33 GMT

@alexdon
You have right but all calculators doing that it's not only Google's. All the calculators are set up to doing 100-80%=20 like (20/100) x 100 but manual. So for me it's wrong because it's not only one company but alls

Re: Calculator it's wrong

_alexdon_ — Fri, 01 Apr 2016 15:47:45 GMT

Mathematically it is the most correct one. You can simply multiply 20% with 100 and you'll get the same answer (the one you're looking for).

You can forward your idea to your Local support but I don't think this needs to be changed, you don't change something that is working correctly.

Re: Calculator it's wrong

Maksim91k — Fri, 01 Apr 2016 16:32:39 GMT

I working with % so I need a "quick" version anyway thank you for your answers.

Re: Calculator it's wrong

_alexdon_ — Fri, 01 Apr 2016 16:37:38 GMT

@Maksim91k But I have tried 100-20% directly on the inbuilt calculator and it resulted 80, not 99.8. Only if you place them between () it will understand the calculus differently.

Re: Calculator it's wrong

Maksim91k — Fri, 01 Apr 2016 16:51:28 GMT

No I place then without () and naturally these numbers is a simple example all my results are "wrong" 😞

[url=http://postimg.org/image/51xdxtvs3/][img]http://s29.postimg.org/51xdxtvs3/Screenshot_20160401_184652.jpg[/img][/url]

[url=http://postimg.org/image/b0h2kx34l/][img]http://s10.postimg.org/b0h2kx34l/Screenshot_20160401_184710.jpg[/img][/url]

Here are my results from sony's Cal and Google's Cal

Re: Calculator it's wrong

Maksim91k — Fri, 01 Apr 2016 16:56:20 GMT

Pictures mistake sorry...

http://s29.postimg.org/5rg6a6wbr/Screenshot_20160401_184652.png

http://s10.postimg.org/ewuegwo49/Screenshot_20160401_184710.png

Re: Calculator it's wrong

_alexdon_ — Fri, 01 Apr 2016 16:58:39 GMT

Yeah, the sony computer does the same 99.8 with and without (). Tested on a Z5c with 6.0. I'll try to get more info on this.

Re: Calculator it's wrong

_alexdon_ — Tue, 05 Apr 2016 10:56:30 GMT

@Maksim91k This should be fixed in an upcoming update. Meanwhile, you can use another calculator or use different ways to calculate.

Re: Calculator it's wrong

Maksim91k — Tue, 05 Apr 2016 11:00:22 GMT

@alexdon
Thank you

Re: Calculator it's wrong

Higins-dad — Tue, 05 Apr 2016 14:08:44 GMT

It's not wrong. 20% is equivalent to 0.2 and so 100-0.2=99.8. If it's 100%-20% then it's 80%.

Re: Calculator it's wrong

Maksim91k — Tue, 05 Apr 2016 15:30:46 GMT

@hitlers-dad what are you saying? If you buy something and it's 100€ with 20% must be 80€, all the calculators are OK not only phones but physical also and now you saying that is normal? Try on your PC and find a business calculator and try it

Re: Calculator it's wrong

Uliwooly — Tue, 05 Apr 2016 20:03:21 GMT

@Higins-dad

@Maksim91k Has a good example, think about it

you go to eat out, the total its $100, you will leave a 20% tip, will the total be $120 or would it be $100.2?

Re: Calculator it's wrong

Higins-dad — Tue, 05 Apr 2016 20:27:09 GMT

Totally understand @uliwooly but the flaws are that you have presumed that the percentage is out of $100. So 20%=$20 etc. However the computer does not understand that you want it to calculate the 20% out of 100. So it presumes 20%=0.2. Get it? it has no amount to find 20% of as it's not stated. Say you said (0.2x100) then it knows it 20% of a hundred. Now granted that us humans an some calculators know to find the percentage of the first number but the calculator if it doesn't do this is technically not wrong.

Re: Calculator it's wrong

Maksim91k — Tue, 05 Apr 2016 21:40:09 GMT

@Hitlers-dad
You are wrong man... 20% it's not 20€ because we don't calculate only this value. If you want to buy a t-shirt and this t-shirt is 74€ but the store has 30% discount how that will cost? With your logic 73,7 .And I can't understand you... Why we must change this calculate method? I tell you all calculators are doing this "100-20%" = 80