Here is a generic form layout with the fields and their CSS classes:

Here's the Javascript:

$(document).ready(function () {
  
  $('.read-only input').attr('readonly',true);
  
  $('.milestable').on('change', 'input', sumtotal);
  
  $('.milestable').on('click', '.form-del-field', sumtotal);

  function sumtotal() {
    var msum = 0;
    var rsum = 0;
    var x = 0.575;
    $('.cf-table-block tbody tr').each(function () {
      var s = 0;
      $(this).find('.milessum input').each(function () {
        s += parseNumber($(this).val());
      });
      var r = s * x;
      $(this).find('.reimbursementsum input').val((r).toFixed(2));
      msum += s;
      rsum += parseNumber((r).toFixed(2));
    });
    $('.totalmiles input').val(msum);
    $('.reimbursementtotal input').val((rsum).toFixed(2));
  }
  
  function parseNumber(n) {
    var f = parseFloat(n); //Convert to float number.
    return isNaN(f) ? 0 : f; //treat invalid input as 0;
  }  
  
  $('.cf-table-add-row').click(function () {
    $('.read-only input').attr('readonly',true);
  });
  
});

And here's a sample form submission: