If you figure a minute or two per chair. Lets say 45 chairs an hour. 17.7 hrs lets say 18-hours worth of work.
What do you target an hour? $100.00-$150.00?
$100.00 x 18 hours, $1800.00/800 chairs = $2.25 each
$125.00 x 18 hours, $2,250.00 /800 chairs = $2.81 each
$150.00 x 18-hours, $2,700.00/800 chairs =$3.37 each