After spending $300 on advertising, Van Harlow has found a buyer for his twin - engineplane. Van can sell the plane for $20,000, but he must then pay $500 to transport the plane to thebuyer. Alternatively, he can keep the machine for use in a new project that came up after heplaced the ads to sell. What is the appropriate cost (in dollars) of keeping the plane for theproject? a. 9.0% b. 9.0% c. 9.1%