John sends his son to prep school.  It cost $20,000 per semester.  There are 2 semesters in the year.  How much does it cost to send the kid to 13 years of school?
It cost 20000*2=$<<20000*2=40000>>40,000 a year
So it cost 40,000*13=$<<40000*13=520000>>520,000
#### 520,000