title: Negative & Positive Percentage Calculation
body: <p>Let's say i have 3 sets of numbers and i want the % of their difference.</p>
  
  <pre><code>30 - 60
  94 - 67
  10 - 14
  </code></pre>
  
  <p>I want a function that calculate the percentage of the difference between each 2 numbers, and the most important is to support positive and negative percentages.</p>
  
  <p>Example:</p>
  
  <pre><code>30 - 60 : +100%
  94 - 67 : -36% ( just guessing )
  10 - 14 : +40%
  </code></pre>
  
  <p>Thanks</p>