It cost 20000*2=$<<20000*2=40000>>40,000 a year

So it cost 40,000*13=$<<40000*13=520000>>520,000

# Answer

520,000
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
520,000
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?
train