How to get percentage value of discount price with JavaScript

This function accepts actual price and discounted price as parameters and returns percentage value.

Function

function percentage(actual_price, discounted_price){

  return Math.abs(Math.round((((discounted_price - actual_price) * 100) / actual_price)));

}

Calling The Function

alert(percentage(100, 75) + '%');

Output

25%

View Demo