calculate and sum cells in Javascript -

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could please me code type of calculation in javascript? super easy started javascript , dont know how it, plaese through excel file, want same website, have table built in html, , when input number in "quantity" cell want calculate per excel file,

https://dl.dropboxusercontent.com/u/32912319/sum.xlsx

thanks lot in advance!

here's html:

<html>  <head>  </head> <body>  <style type="text/css">  td {border:1px solid black;             height: 30px;             width: 50px;}</style>  <table>   <tr><td>price</td><td>100</td><td>200</td></tr>     <tr><td>quantity</td><td></td><td></td></tr>     <tr><td>subtotal</td><td></td><td></td></tr>     <tr><td>total</td><td></td><tr>   </body> </html>


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