What caculation do I use to find what the amount of tax was on a purchase.?

Question

I have a total purchase price of $200 but do not know the tax charged. The rate is 7.75%. I know there is a calculation I can use.

Answer 1

multiply 200 by .0775, this is how much tax you spent.
(200)*(.0775)= 15.5 this means you spent $15.50 in tax

Answer 2

To find the original price without the tax, divide by 1.0775. Therefore the original price without the tax would be $185.62 and the tax was $14.38

You can verify this by multiplying $185.62 by .0775 to get the tax or 1.0775 to get the total with tax.