Sorry, Jo.
I read wrongly.
I calculated that you must have taken a $50,000 car loan.
Your SE friend gets 1.5% commission from your loan amount, so that works out to $750 in commission.
For insurance, he/she gets 8% in commission.
So if your insurance premium is $2,000, he/she gets $160 in commission.
And if you trade in your car, he/she gets $300 in commission from the car dealer.