Teaching the Importance of Math to Students

The deficiency is $1080.00
At 10% factor multiply by 1.11111
rounds to $1200 added to both cars
$21,800+$1200=$23000*.1=$2300
$600+$500+$1200=$2300
22% flat of the remainder added in and divided by 48 months...
$23,000-$2300=$20,700*1.22=$25,524/48=$526
$526 rounded to nearest dollar
PIN 0526

Yeah, I'm actually confused by the question. Why would the dealer inflate the price of the car? Then he'd have to cheat MORE on the trade-in.

Aren't there infinitely many solutions? (Perhaps it's constrained by knowing how many digits the passcode is.)

If you can't get an interest rate better than that, you should buy a cheaper car and work on your credit rating.

Let's see divide the (mumble mumble) carry the zero (mumble mumble) ... oh, I'll just give up using the phone!