# Thread: % is not math is devil

1. ## % is not math is devil

Hi everyone,

I really need help to understand how to operate % in basic math. here is my problem:

a game in xbox store price $7 and 60% off how much the game would be without 60% off?? I don't just need the answer but a proper way to solve this kind of problem. Thanks in Advance!! Why You messing up with the Routine!! 2. ## Re: % is not math is devil let the original price be$x$60% of$x$is \$7

so

$\dfrac{60}{100}x = \$70.6x=\$7$

$x = \dfrac{\$7}{0.6} = \$11.\bar{6} \approx \$11.67$3. ## Re: % is not math is devil Let P_list = the list price (before the 60% discount). Let P_discount = the price after the 60% discount. The relationship between these two prices is:$\displaystyle P_{discount} = P_{list} - 0.6P_{list}$A little manipulation yields:$\displaystyle P_{list} = \frac {P_{discount}} {1-0.6} = \frac {P_{discount}}{0.4}$Now you can substitute$7 for P_discount, and calculate what the list price is.

Originally Posted by romsek
let the original price be xx

6. ## Re: % is not math is devil

x = original price

Code:
               x

- .6x          7
x - .6x = 7
x(1 - .6) = 7
.4x = 7
x = 7 / .4
x = 17.50

7. ## Re: % is not math is devil

Thanks a lot @DenisB this is the one that I understood. thanks all of you it was nice to meet you and get help from you.

Why You messing up with the Routine!!

8. ## Re: % is not math is devil

Why You messing up with the Routine!!
Reste tranquille, mon tabarnak!

9. ## Re: % is not math is devil

Originally Posted by DenisB
Reste tranquille, mon tabarnak!

Why You messing up with the Routine!!

10. ## Re: % is not math is devil

That was a joke...

Anyway, what do you mean with "messing up with the Routine"?

11. ## Re: % is not math is devil

Originally Posted by DenisB
That was a joke...

Anyway, what do you mean with "messing up with the Routine"?
Sorry then!! I don't used to this kind of slang or vocabulary. " messing up with the Routine" is my signature. and it's from one of my favorites song from drake.

Why You messing up with the Routine!!

12. ## Re: % is not math is devil

Oh I see...why don't you put it in the "signature option": go to "settings".

Then it'll appear automatically.

13. ## Re: % is not math is devil

Originally Posted by DenisB
Oh I see...why don't you put it in the "signature option": go to "settings".

Then it'll appear automatically.
that's what I did!!

Why You messing up with the Routine!!

14. ## Re: % is not math is devil

Let the price of the game in xbox store before giving 60% off is $P. Price after 60% off = P - (60% of P) = P - (60P/100) = P - (3P/5) = 2P/5 It is given that price after 60% off =$ 7
So,
2P/5 = $7 P = (7 * 5)/2 = 35/2 P =$ 17.5

15. ## Re: % is not math is devil

Originally Posted by rahuljoshi
Let the price of the game in xbox store before giving 60% off is $P. Price after 60% off = P - (60% of P) = P - (60P/100) = P - (3P/5) = 2P/5 It is given that price after 60% off =$ 7
So,
2P/5 = $7 P = (7 * 5)/2 = 35/2 P =$ 17.5
It was just a typo error in the above post which is corrected. I hope it helps you.

Let the price of the game in xbox store before giving 60% off is P.

Price after 60% off = P - (60% of P) = = P - (60P/100) = P - (3P/5) = 2P/5

It is given that price after 60% off = 7

So,

2P/5 = 7

P = 17.5