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