Unsure why my function won’t execute the discount section of the code, but runs the other half? [duplicate]

below I have written my script code and html portion for a section of my code that I feel may contain an error that my eyes are not catching. In this code, there is supposed to be a discount section, if a user clicks ‘yes’ instead of ‘no’, a 10% discount is applied, the ‘no’ part runs fine, but the ‘yes’ part doesn’t. I have already checked for syntax and grammatical errors but feel that I may be skimming over them, or my code might be missing an important piece. I have put my code down below, both the script and html portions. If anyone has any insight or spots something, please let me know! Thanks!

var membersDiscount;
    membersDiscount = document.getElementById("radFirstChoice").value;
    if (radFirstChoice == "Yes") {
        membersDiscount = (results * .10);
    }
    else {
        membersDiscount = 0;
    }

    var truePrice; 
    truePrice = results - membersDiscount;
    truePrice = parseFloat(truePrice);
    truePrice = truePrice.toFixed(2);

<p><label>Are you a member of our frequent shipper club?</label></p>
<p><label for="radFirstChoice">Yes</label>
     <input type="radio"  id="radFirstChoice"  name="userInformation"></p> 
<p><label for="radSecondChoice">No</label>
    <input type="radio"  id="radSecondChoice" name="userInformation"></p>