The bill at an electronics store was 90$ before tax. Tax is 8 percent. What is the total price with tax?

$97.20

Step-by-step explanation:

Let P = the percentage, x = the bill before tax, and y = the amount of tax

Here I am using the formula P%*x=y.

So, first we replace the variables with their values: 8% * 90 = y

Now we divide 8 by 100 to turn it into a decimal*, which is 0.08: 0.08 * 90 = y

(*Why 100, instead of 10 which would give us 0.8? Because 0.8 is equal to 80%, and here we need 8%.)

Next, we multiply these two terms: 7.2 = y

Therefore, the tax is $7.20. However we still need to add this to the total: 90+7.2

And that equals 97.2. Now we add a dollar sign and a 0 on the end (does not change the value) so it is a proper monetary value: $97.20