title: How to calculate percentages?
body: <p>I want to calculate what is $x percentage of a $total. $x could be 15%, 20%, etc, and $total could be 1000, 2000, etc. So I'd want the 15% of 1000, for example.</p>
  
  <p>What is the formula for calculating this? (I know this isn't <em>exactly</em> a coding question but I'm coding this feature and need help!</p>