<div id="quantityHoleForPercentage">
<form:input path="quantity11Profit"  id="quantity11Profit" cssClass="smaller" />
</div>
<div id="quantityHoleForPercentage">
<form:input path="quantity11Price"  id="quantity11Price" cssClass="smaller" />
</div>

$("#quantityHoleForPercentage input").change(function(){
    var needless=$(this).attr('id');
    var willWriteToPriceInput= $(this).val();
    var priceInput=$(this).next();
    priceInput.val(willWriteToPriceInput);
    });

$("#quantityHoleForPercentage input[id$=Profit]").change(function(){
  var willWriteToPriceInput= $(this).val();
  var priceInput = $(this).parent().next()
  priceInput.val(willWriteToPriceInput);
});