Guest: :x at a electronic store a tv costs $215 If the sales tax is 7% how much was the tv
I suggest you have a look at these two pages to have an idea about percentages
http://www.mathsisfun.com/definitions/percent.html
http://www.mathsisfun.com/percentage.html
Furthermore, what I miss in the question is whether the tv is $215 including the sales tax or without.
If the $215 is including the sales tax, then we know that 7% is sales tax and 100%-7% = 93% is the tv,
Hence $215*(93/100) = $199.95 would then be the price of the tv.
If the $215 is excluding the sales tax, then we know the tv costs an additional 7% of the initial amount.
Therefore the real price would then be 100%+7% of the original amount.
Hence $215*(107/100) = $230.05 would then be the price of the tv.
Look back into the question and see which one applies to your case.
+2353 
