Suppose you can buy a new Toyota Corolla for $20,000 and sell it for $12,000 after six years. Alternatively, you can lease the car for $300 per month for three years and return it at the end of the three years. For simplification, assume that lease payments are made yearly instead of monthly - i.e., that they are $3600 per year for each of three years. If the interest rate, r, is 4%, is it better to lease or buy the car? a