A bus was purchased and placed in service. It costs $50,000 with a trade in of the old bus which is valued at $9,000. The new bus has an estimated MV (market value) of $13,000 at the end of an estimated useful life of 9 years. Compute the depreciation amount in 4th year (d4) and the BV at the end of the eighth year (BV8) of life using each of the GDS and ADS method. Round your answer to the nearest integer.