Writes the value undefined Node.js, MySql, how to fix it?

Question

MySQL

In the console it displays the values ​​correctly, but on the web page it displays the value undefined.
console:

app.get("/order.html", function(request, response){
con.query("SELECT Sum(Cost) FROM Orders", function (err, result, fields) {
  if (err) throw err;
  console.log(result);
    let rezc = '';
      fs.readFile("crm/order.html", "utf8", function(error, data){
      rezc  += '<p>'+result[0].cost+'</p>';  //я так понимаю тут нужно что-то изменить
      data = data.replace("{rezc}", rezc);
      response.end(data);
      });
});
});

When counting the number of lines, it outputs everything perfectly.