When a kid in Reddit user dimetri's class was caught using his phone in math class, the teacher seized it, set a new pass code and then gave him this note to figure out the new code. That's one way to impress the importance of math skills on to your kids.
Link Via Gizmodo
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