Mathematicians! How do I calculate percent difference?

[ibex333]

Not sure how to properly google for this... What is the phrase I should type into google?


Lets say I got 2 identical CPUs... One runs at 1.86GHZ and the other at 3.06GHz... How much percent is one faster/slower than the other?

or...


I ran a mile in 40min while my friend ran it in 50min... How many percent was I faster?


Stuff like that....


How do people calculate these things?

 

[Atomic Playboy]

You could try a Google search for "How to calculate percentages" and go from there.

 

[FleshLight]

Enroll in gradeschool

 

[DrPizza]

Difference divided by actual, times 100.

Note: 100 is 25% more than 80.
80 is 20% less than 100.

<hopefully, not mind blown>


And, if a company says, "hey, we're going to cut everyone's pay by 20% this year, but don't worry, next year, we'll give you a 20% raise," you're going to be making less the 2nd year than you were originally. And, when they say, "everyone gets a 10% raise," everyone isn't getting the same raise. Those making $100k per year get a $10k raise. Those making $40k per year only get a $4k raise.

 

[SunnyD]

Enroll in gradeschool

Pretty much this.

 

[Scarpozzi]

Your OP example is flawed because you didn't factor in cores, instruction sets, multi-threading, hyper-threading, motherboard clock speed, memory speeds or other bottlenecks presented by the two mis-matched technologies. A simple percentage will not be accurate representation on which is faster or by how much unless rendered by a particular benchmark.

 

[rcpratt]

For serious?

 

[RagingBITCH]

Difference divided by actual, times 100.

Note: 100 is 25% more than 80.
80 is 20% less than 100.

<hopefully, not mind blown>


And, if a company says, "hey, we're going to cut everyone's pay by 20% this year, but don't worry, next year, we'll give you a 20% raise," you're going to be making less the 2nd year than you were originally. And, when they say, "everyone gets a 10% raise," everyone isn't getting the same raise. Those making $100k per year get a $10k raise. Those making $40k per year only get a $4k raise.

Or (new-old)/old

 

[ibex333]

Enroll in gradeschool

Don't be like that. First of all they didn't teach me that in grade school. I had horrible Math teachers. Second, even if they did, I wouldn't remember any of it so many years later unless I needed to use that kind of math often.

For serious?

Yes, why the hell are people such snobs? It's not like I'm supposed to know that. Yes, I don't know how to calculate percents! Am I a 2nd grade person to you now?

Pretty much this.

Sorry bud. Too late for that. The horrible US education system screwed me. We were more worried about getting bullied back than, as opposed to listen to the Math teacher which wasn't teaching much of anything anyway.

Your OP example is flawed because you didn't factor in cores, instruction sets, multi-threading, hyper-threading, motherboard clock speed, memory speeds or other bottlenecks presented by the two mis-matched technologies. A simple percentage will not be accurate representation on which is faster or by how much unless rendered by a particular benchmark.

Lets assume ALL hardware was identical.

 

[blinblue]

Not sure how to properly google for this... What is the phrase I should type into google?


Lets say I got 2 identical CPUs... One runs at 1.86GHZ and the other at 3.06GHz... How much percent is one faster/slower than the other?

or...


I ran a mile in 40min while my friend ran it in 50min... How many percent was I faster?


Stuff like that....


How do people calculate these things?

http://www.wolframalpha.com/input/?i=percent+difference+between+1.86+GHz+and+3.06+GHz

 

[Imp]

Pick your base point or frame of reference, then do whatever the hell you want.

 

[Smoblikat]

Not sure how to properly google for this... What is the phrase I should type into google?


Lets say I got 2 identical CPUs... One runs at 1.86GHZ and the other at 3.06GHz... How much percent is one faster/slower than the other?

or...


I ran a mile in 40min while my friend ran it in 50min... How many percent was I faster?


Stuff like that....


How do people calculate these things?

I got 64% faster. Not sure if im right, but I did 3.06 - 1.86 = X. X/1.86 = ~64%

 

[Humpy]

And, when they say, "everyone gets a 10% raise," everyone isn't getting the same raise. Those making $100k per year get a $10k raise. Those making $40k per year only get a $4k raise.

Fuck you. That's not fair!

 

[ibex333]

http://www.wolframalpha.com/input/?i=percent+difference+between+1.86+GHz+and+3.06+GHz

Thank you very much. It was so easy! I had no idea. Even someone so horrible in math like me wouldn't have any trouble using this simple formula.

Now if someone could explain to me WHY this formula works the way it works? Why do we have to divide by the lesser number after subtracting it from the bigger number?

 

[amdhunter]

Enroll in gradeschool

This is America jerk. Kids here don't learn this stuff until Grad School, if ever.

 

[Smoblikat]

Thank you very much. It was so easy! I had no idea. Even someone so horrible in math like me wouldn't have any trouble using this simple formula.

Now if someone could explain to me WHY this formula works the way it works? Why do we have to divide by the lesser number after subtracting it from the bigger number?

I dont know for sure, But I think you take the Bigger number and subtract the smaller one to find the difference between the two. Then you divide the difference into the smaller number to get the total percentage the difference accounts for of the smaller number.

 

[Anubis]

Yes, why the hell are people such snobs? It's not like I'm supposed to know that. Yes, I don't know how to calculate percents!

yes, yes you are supposed to know this

 

[felang]

(3.06/1.86)-1 = 64.5%

I went to grade school in Central America and they taught us how to work with percentages. Schools in the US must really suck.

 

[Smoblikat]

(3.06/1.86)-1 = 64.5%

I went to grade school in Central America and they taught us how to work with percentages. Schools in the US must really suck.

You have no idea how bad US schools are......im 20 and have never seen this formula before.

 

[Rakehellion]

Lets say I got 2 identical CPUs... One runs at 1.86GHZ and the other at 3.06GHz... How much percent is one faster/slower than the other?

3.06 / 1.86 = 1.64 = 64% faster.

I ran a mile in 40min while my friend ran it in 50min... How many percent was I faster?

A snail could run a mile in 50 minutes.

Convert to miles per hour first.

 

[Rakehellion]

You have no idea how bad US schools are......im 20 and have never seen this formula before.

What formula did you use?

 

[Rakehellion]

And, when they say, "everyone gets a 10% raise,"

No one has ever said that.

 

[Printer Bandit]

In excel,

A = old value
B = new value

percent difference = (B-A)/ABS(B)

 

[MrDudeMan]

This is a good link. Someone already said it, but pick a frame of reference and go from there.

 

[MrDudeMan]

(3.06/1.86)-1 = 64.5%

I went to grade school in Central America and they taught us how to work with percentages. Schools in the US must really suck.

You can lead a horse to water, but you can't make it drink. I learned this in 5th grade in the US. Most of the dipshits here learned it at some point and then forgot due to being dipshits.