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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 proudly stated, "This is where your problem is". The part was replaced and the machine worked perfectly again.
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 in peace.