title: How to get the actual value after subtracting discount(%)
body: <p>I want to get the total amount with the help of Final amount and Discount rate.</p>
  
  <p>For Example.</p>
  
  <p>Grand total  = 100</p>
  
  <p>Discount     = 15%</p>
  
  <p>Final Amount =100*.15=85</p>
  
  <p>if I have only two variables </p>
  
  <p>Final amount = 85</p>
  
  <p>Discount     = 15%</p>
  
  <p>Grand total  = ?</p>
  
  <p>Now I can get back Grand total with the help of "Final Amount" and "Discount rate"?</p>