Ya so you can bill twice! Once to do it the way the customer wants and a second time to do it right once they realize their mistake.

MECHANIC

HOURLY RATE

$100/HR ==== STANDARD

$150/HR ==== IF YOU WATCH

$175/HR ==== IF YOU HELP

$200/HR ==== IF YOU WORKED ON IT FIRST

$250/HR ==== IF YOU TELL ME HOW TO DO MY JOB