This is an old story. But the moral does not change.
A repair-man was called to repair the typewriter.
He opened the typewriter, looked attentively for a few minutes, took his screwdriver
and tightened a screw. And gave a bill for Rs.100.
The customer said that the bill was exorbitant and asked for a break-up of the bill.
The repair-man said:
Charges for tightening the screw: Rs. 5
To know which screw to tighten: Rs. 95