I later found out that the first pencil is arrived at by the dealership in a very unscientific way. For every $10,000 that is financed, the down payment they try to get is $3,000 and the monthly payment they try for is $250. In this way, a $20,000 family sedan would require about $6,000 down and a $500 a month payment. (These payments are based on very high interest rates calculated on five-year loans. These numbers are so inflated that a manager I later worked with laughingly called them, "stupid high numbers.")
Confessions Of A Car Salesman