Math brain fart help
 

i've been out of school for too long and im having a brain fart here

an example:

if a total is $155 including 5% tax, what is the sub total without tax? i cant remember the formula.



edit: cleared up the question

its 155 x .05 = 7.75 + 155

162.75

or are you asking how much without tax? you can pretty much do it backwards itll be a bit off, i dont know the exact formula. so like around $148.50-$149

$155x.95% (of total)= $147.25

This is wrong.... ughhh let me think about this.

147.62 would be your answer.

Since 147.62 x .05 = 7.381
7.381 + 147.62 = 155.001

Which is pretty much as close as it is going to get.

It was already included. He is looking to before the taxes were added on as he said it was "included with 5%".

155 x (100% - 5%) = ??

i think that's it

we are going the oposite way here. trying to figure out how much without tax. so you cant simply subtract the % from the total

155*5%=7.75
155-7.75 = 147.25
but 147.25+5% does not equal 155


i figured it out the equasion but i suck at working it thru
X + (X * 0.05) = 155




edit: once i remembered that y is, infact, a number, and put a 1 infront of it, it was easy. god ive been out of school for too long!

1y+0.05y=155
1.05y=155
y=155/1.05
y= 147.6190476 or 147.62

$155 / 1.05 = $147.62
$147.62 * 1.05 = $155

^ what he said

x + 0.05x = 155

LOL math is definitely not revscenes domain

the right answer... 155 is INCORRECT

x times 1.05 = 155

155/1.05 = 147.62

Check

147.62 x 1.05 = 155.001

How many more times will people post the solution - when it has been posted already?! :p

Here it is again for good measure

$155/1.05 = answer

Diu, we all want to look smart ar ma

The lack of mathematical ability here never fails to amaze. :lol

omg, we're all retarded hahha...

then again, i've never used anything over math 9 in real life.

"Hi there, math... not my forte, but THAT is" *points down*

http://cache.gawker.com/assets/image..._Kia_Forte.jpg

included for great justice

Remember the fireman jingle and the Jared jingle? I avoided Subway just because of those commercials.

Oh yea..

x * 1.05 = $155
x = $155/1.05

this thread is funny. it just made my day!

155 / 1.05 = 147.62
147.62 x 1.05 = 155.00

Thats it!

I hate math

http://www37.wolframalpha.com/input/...s+1.05+%3D+155

I win; Also, this site is incredible if you have ANY math related questions, havn't really played around with it for anything else. It's like Google for equations.

Also, I feel sorry for the OP because that's really really really fucking basic math....I don't really understand how you could forget that O_o

lol @ how long it took for an answer

you guys are ridiculous especially op, it just a reverse question.