Give the step-by-step reasoning process and then the final answer. 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 = $40,000 a year. So it cost 40,000 * 13 = $520,000.
The final answer: 520000.