title: how to find percentage
body: <p>I want to show risk ratio in my application.</p>
  
  <p>I want to get this value in percent for example</p>
  
  <p>let a = 100, b = 50;</p>
  
  <p>I want to show the value in percentage value = a - b;
   = 50;</p>
  
  <p>I want to show this in percentage.</p>
  
  <p>any suggestions.</p>
  
  <p>Thanks In Advance.</p>