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Dec 15th, 2018
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  1.     $("tr").each(function(){
  2.         var tr = $(this);
  3.         td.find("поле с количеством").on("cut keyup input change", function(){
  4.             tr.find("поле с ценой").text(price * $(this).val());
  5.         })
  6.     })
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