Assume the average starting income of a high school graduate is $$40,000$ per year for four years and the cost of going to college is $$45,000$ per year for four years. Also, assume that after graduating from college people work for $40$ years. On average, if a college student earns $$50,000$ per year, how many years will it take to breakeven with a high school student? $($Ignore any other concepts like interest rates, present value and risk, etc., which may be covered later.$)$