javascript - JS GST calculation form total is multiplying more then it should -

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my total * 10 reason, have made stupid mistake somewhere. working out calculation method form building stuck on last element.

the gst input has no decimal place not overly bothered @ point can added later see should + both elements , output.

    <!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <title>untitled document</title> </head>  <body> <script type="text/javascript"> function updateprice() {       // ex-gst price form element var exprice = document.getelementbyid("ex-gst").value; var tprice = document.getelementbyid("gst").value;  // gst price gstprice = exprice * 0.1; tprice = gstprice + exprice;  // set gst price in form element document.getelementbyid("gst").value = gstprice; document.getelementbyid("inc-gst").value = tprice;  } </script>  <table border=0 cellspacing=2 cellpadding=2>       <tr>         <th width="5"> </th>         <th width="264"> </th>         <th><font size="2" face="geneva, arial, helvetica, sans-serif">attendees</font></th>       </tr>       <tr>         <td align=center> </td>         <td align=right>calculate</td>         <td align=right> <input id="ex-gst" name="ex-gst" value="0.00" size=7 maxlength=10 onchange="updateprice()"></td>       </tr>       <tr>         <td align=center> </td>         <td align=right> 12.5% g.s.t </td>         <td align=right> <input type=text id="gst" name="gst" size=7 maxlength=10 value="0.00" onchange="updateprice()"></td>       </tr>       <tr>         <td align=center> </td>         <td align=right>total payable</td>         <td align=right> $             <input name="inc-gst" id="inc-gst" type="text" value="0.00" size=7 maxlength=10  onchange="updateprice(this.form)">         </td>       </tr>   </table>   </body> </html>

got working, had make slight edits

<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <title>untitled document</title> </head>  <body> <script type="text/javascript"> function updateprice() {       // ex-gst price form element var exprice = document.getelementbyid("ex-gst").value; var gstprice = document.getelementbyid("gst").value;  // gst price gstprice = exprice * 0.1; var tprice = parseint(gstprice) + parseint(exprice);  // set gst price in form element document.getelementbyid("gst").value = gstprice; document.getelementbyid("inc-gst").value = tprice;  } </script>  <table border=0 cellspacing=2 cellpadding=2>       <tr>         <th width="5"> </th>         <th width="264"> </th>         <th><font size="2" face="geneva, arial, helvetica, sans-serif">attendees</font></th>       </tr>       <tr>         <td align=center> </td>         <td align=right>calculate</td>         <td align=right> <input id="ex-gst" name="ex-gst" value="0.00" size=7 maxlength=10 onchange="updateprice()"></td>       </tr>       <tr>         <td align=center> </td>         <td align=right> 12.5% g.s.t </td>         <td align=right> <input type=text id="gst" name="gst" size=7 maxlength=10 value="0.00" onchange="updateprice()"></td>       </tr>       <tr>         <td align=center> </td>         <td align=right>total payable</td>         <td align=right> $             <input name="inc-gst" id="inc-gst" type="text" value="0.00" size=7 maxlength=10  onchange="updateprice(this.form)">         </td>       </tr>   </table>   </body> </html>

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