Angela spent $30.00 at a resturaunt. if she leaves a 15% tip, how much wll her total bill be

 Her total bill will be:  " $34.50 " . 

Explanation:

 15% = 15/100 = 15 ÷ 100 = 0.15 .

$30 + {0.15 * $30} = $30 + ($4.50) = " $34.50 " .


Note:  "15% of $30 = (0.15 * $30) = $4.50 .

We add the "$4.50" tip to the $30.00 that is spent; to get:  " $34.50 " .