So to answer this question, you need to know how to convert a percent to a decimal. This is achieved by starting behind your number, and moving it back two places.
So 8% becomes 8. -> .8 -> .08.
Then, you can multiply the cost of the meal, $27.00, by the sales tax, .08.
$27.00 x .08 = $2.16.
So $2.16 is your sales tax. Then, just add the tax on to the meal!
$27.00 + $2.16 = $29.16!