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sum=0; 
$('.tabellebg .tarifiert').each(function() { 

val = $(this).html(); 
formatted_val = val.replace(".", "").replace(" kB", "").replace(" ", ""); 
val_to_int = parseInt(formatted_val);

if(!isNaN(val_to_int)) { 
  sum +=val_to_int; 
}

}); 
console.log(sum)