Eben figures he can work a part-time job for 20 hours a week, 50 weeks a year, for the next four years to earn money for his higher education. He wants to pursue a two-year program at a community college and figures he will need $22,500 each year for tuition, fees, and living expenses. What is the minimum he must make per hour?
In one year, Eben needs to earn $22,500 * 2 = $<<22500*2=45000>>45,000.
In four years, he needs to earn $45,000 * 4 = $<<45000*4=180000>>180,000.
He will work for a total of 20 hours/week * 50 weeks/year * 4 years = <<20*50*4=4000>>4,000 hours.
Therefore, he must make $180,000 / 4,000 hours = $<<180000/4000=45>>45 per hour. Answer: \boxed{45}.