I have an issue (besides the fact that I'm a moron). I have forgotten how to calculate sales tax only knowing the final amount and the percentage.

For example:

You are given a non-itemized invoice for 2294.83, and you know the tax rate is 6.5%. How do you find out what the number was BEFORE the 6.5% was applied?

In this case, 6.5% was applied to some number, and the result is 2294.83.

I ave tried evey method I can think of.