英语翻译Once there was something wrong with a machine in a facto

英语翻译
Once there was something wrong with a machine in a factory.The workers could do nothing but turn to a German engineer for help,who drew a line on it and then said,“Take off the part where the line is and change it for a new one.” The machine,with a new line on began running well again.The engineer then asked for $30,000 for what he had done.The following were what he wrote on a bill,“The new part only costs one dollar,and knowing where the problem with the machine is costs $ 29,999.”
One dollar for changing a new part sounds reasonable,but the $29,999 is exactly the value of wisdom and knowledge.