Percentage of a Number ?

SuperLynx · 2013-11-09 11:29:03

How do I calculate the percentage, one number taken away from another number; here is an example:

2345-1278 = 1067

What would be the percentage ?

bobbym · 2013-11-10 04:22:22

Hi;

Percentage of what to what?

The 1067 to the 2345?

So you say about 45.5%

Or do you want the percentage reduction?

SuperLynx · 2013-11-10 04:34:00

If I told you $2345 and you told me you only wanted to pay $1067 how much percentage would you want off, would that be the same as what you mentioned 45.5% ?

Last edited by SuperLynx (2013-11-10 04:34:22)

bobbym · 2013-11-10 04:51:43

Subtract 2345 from both sides.

Divide both sides by - 2345.

You get .5449893390191898. So you would need a 54.49893390191898% reduction.

SuperLynx · 2013-11-10 05:15:47

If you subtract 54% from 2345 you get 1266.3 not 1278 ?

.54% that is a decimal, hrmm

Last edited by SuperLynx (2013-11-10 05:18:02)

bobbym · 2013-11-10 07:24:02

54% is not the correct answer that I gave you.

SuperLynx · 2013-11-10 12:28:43

I never said that was the correct answer you gave me ! <sigh>

I wanted to know where you got the decimal .54 from ?

2345-2345 obviously gives you 0 yet you say it gives 1067 ?

If I subtract 1278 from 2345 I get 1067

1278 / 2345 = .54

Are you saying that if you wanted to pay only $1278 from the original price of $2345 that would be a .54 or 54% cut ?

bobbym · 2013-11-10 18:43:56

I never said that was the correct answer you gave me ! <sigh>

You are missing what I am saying. 54% is not the answer I gave you, you have rounded off the correct answer.

Post #4, that is where the 54.49893390191898% is coming from. If you keep doing your calculations as 54% you will have an error.

Are you saying that if you wanted to pay only $1278 from the original price of $2345 that would be a .54 or 54% cut ?

Nope, I am not saying any of that. First of all where do you get 54% from? I am saying if you take a 54.49893390191898% reduction you will come out with 1067 ( a number very close to it!).

SuperLynx · 2013-11-11 02:25:08

You get .5449893390191898. So you would need a 54.49893390191898% reduction.

That is where I'm getting the 54 !

bobbym · 2013-11-11 02:28:49

It is not 54, it is 54.49893390191898 %.

SuperLynx · 2013-11-11 02:48:46

I'm rounding as you said, when you round it's 54 !

SuperLynx · 2013-11-11 02:52:41

2345 - 54% = 1266

A little off from 1278, but close.

bobbym · 2013-11-11 02:53:37

I never said to round in the calculation.

bobbym wrote:

So you say about 45.5%

That was just for convenience. If I were speaking that I would say about 45%. But in a calculation if you use a number that you say is about this then the answer is rounded also. That is why you are getting 1266.3 not 1278.

SuperLynx · 2013-11-11 02:56:58

2345 - 45% = 1289

I don't understand what you meant
>>>That was just for convenience. If I were speaking that I would say about 45%. But in a calculation if you use a number that you say is about this then the answer is rounded also. That is why you are getting 1266.3 not 1278.

bobbym · 2013-11-11 03:00:13

2345 - 45% = 1289

The above statement is incorrect and in math correctly stating the problem is the difference between solving it and not solving it. You can not subtract 45% from 2345. You can subtract 45% of something from 2345.

SuperLynx · 2013-11-11 03:04:56

You can't subtract 45% from 2345, you can subtract 45% of something from 2345, show me an example !

bobbym · 2013-11-11 03:08:14

If I get 45% off that is the decimal .45

If I get 54.49893390191898 % off that is the decimal .5449893390191898

SuperLynx · 2013-11-11 03:13:51

In your example;
2345 - .45 what is that multiplication symbol after that, all I see is a dot ?

bobbym · 2013-11-11 03:16:29

The dot between the .45 and the 2345 means multiply. It can also be written,

SuperLynx · 2013-11-11 16:33:37

bobbym wrote:

The dot between the .45 and the 2345 means multiply. It can also be written,

Doing the above math always gives me 5497969.75 not 1289.75

anonimnystefy · 2013-11-11 21:32:24

That's because you are doing subtraction before multiplication. When there are no parenthesis, you do multiplication before addition and subtraction.

phrontister · 2013-11-11 22:35:20

Many calculators, particularly scientific calculators (eg, M$oft's scientific calculator), will automatically do the operations in the correct order (BODMAS) without needing to use parentheses, but simpler calculators (eg, that same M$oft calculator set to the 'Standard' option) usually won't.

For key presses "2345-.45x2345":
M$oft Scientific = 1289.75
M$oft Standard = 5497969.75

With my HP32SII RPN Scientific the key presses are:
2345
Enter
.45
Enter
2345
x
-
Answer = 1289.75

anonimnystefy · 2013-11-11 22:51:49

Reverse Polish notation?

phrontister · 2013-11-11 23:18:25

Yes...which my HP48SX Scientific has too.

bobbym · 2013-11-11 23:41:33

Doing the above math always gives me 5497969.75 not 1289.75

One problem at a time. Do you understand the percentage we are talking about?

Math Is Fun Forum

#1 2013-11-09 11:29:03

Percentage of a Number ?

#2 2013-11-10 04:22:22

Re: Percentage of a Number ?

#3 2013-11-10 04:34:00

Re: Percentage of a Number ?

#4 2013-11-10 04:51:43

Re: Percentage of a Number ?

#5 2013-11-10 05:15:47

Re: Percentage of a Number ?

#6 2013-11-10 07:24:02

Re: Percentage of a Number ?

#7 2013-11-10 12:28:43

Re: Percentage of a Number ?

#8 2013-11-10 18:43:56

Re: Percentage of a Number ?

#9 2013-11-11 02:25:08

Re: Percentage of a Number ?

#10 2013-11-11 02:28:49

Re: Percentage of a Number ?

#11 2013-11-11 02:48:46

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#12 2013-11-11 02:52:41

Re: Percentage of a Number ?

#13 2013-11-11 02:53:37

Re: Percentage of a Number ?

#14 2013-11-11 02:56:58

Re: Percentage of a Number ?

#15 2013-11-11 03:00:13

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#16 2013-11-11 03:04:56

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#17 2013-11-11 03:08:14

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#18 2013-11-11 03:13:51

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#19 2013-11-11 03:16:29

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#20 2013-11-11 16:33:37

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#21 2013-11-11 21:32:24

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#22 2013-11-11 22:35:20

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#23 2013-11-11 22:51:49

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