I do know that. In the past, those incentives were far less and varied based on monthly quotas. Typically, the holdback was in the $300+ range, but that was many years ago. Probably more now.
Therefore the dealership made $2,900 from difference between invoivce & MSRP, plus $1,000 market adjustment surcharge, plus $800 holdback from our second car purchase this year = $4,700 dealer earnings on a (pre-tax, license, registration, fees) $40,000 sale. (walk-out price = a bit over $42,000 as fees & taxes equal a bit over $2,000.)
$4,700 = 11.75% of $40,000.