jQuery get value of selected radio button

Question

The problem statement is simple. I need to see if user has selected a radio button from a radio group. Every radio button in the group share same id.

The problem is

Answer 1

Check the example it works fine

  Metal purity : 
    
    
    92 %
  
    
    
    75 %
  
    
    
    58.5 %
  
    
    
    95 %
  
    
    
    59 %
  
    
    
    76 %
  
    
    
    93 %
  
   

var check_value = $('.gold_color:checked').val();