If you have an amount of money which has had 10 percent taken off it how can you find out what 15 percent off would be?

Find the original amount.

Let's say that you now have $90, which has had 10% taken off of something.

Use a variable x : x = original amount

$90 = 90% of x

$90 / .9 (90%) = x

$100 = x

So your original amount would be $100

Now take off 15% - ->100 x .15 = 15

100 - 15 = 85

But, if you are lazy and just want a formula, here is how you would do it:

If m is your amount of money you have now (after 10% has been taken off), then the formula is as follows-

(m / .9) x .85