
In desperation, they called on the retired engineer who had solved so many of their problems in the past. The engineer reluctantly took the challenge. He spent a day studying the huge machine. At the end of the day, he marked a small "X" in chalk on a particular component of the machine and stated, "This is where your problem is."
The part was replaced and the machine worked perfectly again. The next week, the company received a bill for $50,000 from the engineer for his service. They demanded an itemized accounting of his charges. The engineer responded briefly:
One chalk mark ... $1
Knowing where to put it ... $49,999
It was paid in full and the engineer retired again in peace.