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hello po patulong naman po ulit, eto po yung code ko kapag po kasa nagcomput NaN po yung lumalabas sa change di ko po makita mali ko eh pakitingan naman po salamat po 
, yun na lang po yung kulang
<html>
<head>
<title>Beverage Store</title>
</head>
<script type="text/javascript">
var ans, y;
function items() {
document.getElementById('S').value = '50';
document.getElementById('M').value = '100';
document.getElementById('L').value = '150';
document.getElementById('s').value = '50';
document.getElementById('m').value = '100';
document.getElementById('l').value = '150';
}
function Procced() {
if(document.getElementById("s").checked){
var x = document.getElementById("s").value;
}
else if(document.getElementById("m").checked){
var x = document.getElementById("m").value;
}
else if(document.getElementById("l").checked){
var x = document.getElementById("l").value;
}
y = parseInt(document.getElementById("order").value);
ans = document.getElementById("amount");
ans.value = x * y ;
}
function payment(){
var bayad = parseInt(document.getElementById("payment").value);
ans = parseInt(document.getElementById("amount").value);
var ansD = document.getElementById("change");
ansD.value = bayad - ans;
}
function discount() {
var discS = (20 / 25) * 50;
var discM = (20 / 25) * 100;
var discL = (20 / 25) * 150;
document.getElementById('S').value = discS;
document.getElementById('s').value = discS;
document.getElementById('m').value = discM;
document.getElementById('M').value = discM;
document.getElementById('l').value = discL;
document.getElementById('L').value = discL;
}
</script>
<body>
<table border='1' style="width:100%">
<tr>
<td><center><h1>Bewan Beverage Store</h1></center></td>
</tr>
<tr>
<td><center>Choose Drinks:
<Select onchange="items()">
<option hidden> Choose Item
<option> Ice Tea
<option> Orange Juice
<option> Alcohol Drinks
<option> Softdrinks
</Select>
<br>
<br>
<input id="s" id="radio1" type="radio" name="size" />Small
<input id="S" type="text" name="prize" disabled>
<br>
<input id="m" id="radio2" type="radio" name="size" />Medium
<input id="M" type="text" name="prize" disabled>
<br>
<input id="l" id="radio3" type="radio" name="size"> Large
<input id="L" type="text" name="prize" disabled>
</center>
</td>
</tr>
<tr>
<td><center>No. of Order <br>
<input id="order" type="text"/>
<br>
<input id="discount" type="checkbox" value="Senior" onclick="discount()"> Senior Citizen 20%
<br><br>
<input type="submit" value="Proceed" onclick="Procced()"/>
</center></td>
</tr>
<tr>
<td><center>
Amount Due:<br>
<input id="amount" type="text" disabled />
<br>
Enter Payment:<br>
<input id="payment" onblur="payment()" type="text"/>
<br>
Change Due:<br>
<input id="change" type="text" disabled/>
</center></td>
</tr>
</body>
</html>
, yun na lang po yung kulang<html>
<head>
<title>Beverage Store</title>
</head>
<script type="text/javascript">
var ans, y;
function items() {
document.getElementById('S').value = '50';
document.getElementById('M').value = '100';
document.getElementById('L').value = '150';
document.getElementById('s').value = '50';
document.getElementById('m').value = '100';
document.getElementById('l').value = '150';
}
function Procced() {
if(document.getElementById("s").checked){
var x = document.getElementById("s").value;
}
else if(document.getElementById("m").checked){
var x = document.getElementById("m").value;
}
else if(document.getElementById("l").checked){
var x = document.getElementById("l").value;
}
y = parseInt(document.getElementById("order").value);
ans = document.getElementById("amount");
ans.value = x * y ;
}
function payment(){
var bayad = parseInt(document.getElementById("payment").value);
ans = parseInt(document.getElementById("amount").value);
var ansD = document.getElementById("change");
ansD.value = bayad - ans;
}
function discount() {
var discS = (20 / 25) * 50;
var discM = (20 / 25) * 100;
var discL = (20 / 25) * 150;
document.getElementById('S').value = discS;
document.getElementById('s').value = discS;
document.getElementById('m').value = discM;
document.getElementById('M').value = discM;
document.getElementById('l').value = discL;
document.getElementById('L').value = discL;
}
</script>
<body>
<table border='1' style="width:100%">
<tr>
<td><center><h1>Bewan Beverage Store</h1></center></td>
</tr>
<tr>
<td><center>Choose Drinks:
<Select onchange="items()">
<option hidden> Choose Item
<option> Ice Tea
<option> Orange Juice
<option> Alcohol Drinks
<option> Softdrinks
</Select>
<br>
<br>
<input id="s" id="radio1" type="radio" name="size" />Small
<input id="S" type="text" name="prize" disabled>
<br>
<input id="m" id="radio2" type="radio" name="size" />Medium
<input id="M" type="text" name="prize" disabled>
<br>
<input id="l" id="radio3" type="radio" name="size"> Large
<input id="L" type="text" name="prize" disabled>
</center>
</td>
</tr>
<tr>
<td><center>No. of Order <br>
<input id="order" type="text"/>
<br>
<input id="discount" type="checkbox" value="Senior" onclick="discount()"> Senior Citizen 20%
<br><br>
<input type="submit" value="Proceed" onclick="Procced()"/>
</center></td>
</tr>
<tr>
<td><center>
Amount Due:<br>
<input id="amount" type="text" disabled />
<br>
Enter Payment:<br>
<input id="payment" onblur="payment()" type="text"/>
<br>
Change Due:<br>
<input id="change" type="text" disabled/>
</center></td>
</tr>
</body>
</html>
