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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?
Wiki User
∙ 15y ago
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
Wiki User
∙ 15y ago
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