9. On September 6, 2006, ABC Company purchased a new boat for $510,000. The estimated life of the boat was 20 years, with an estimated residual value of $50.000. On October 1, 2019, the boat was sold for $78.000. ABC Company used double-declining balance method and applied half- year convention. What was book value of the boat in the beginning of the year of 2007? (3 Points)