can someone please help me solve this. i dont know what im doig wrong I only got one part right, but don't know which one. thanks in advance!!

Exon Company purchased equipment for $360,000 on January 1 , 2018. The equipment has an estimated residual value of $30,000 and an estimated useful life of 10 years. The company depreciates the equipment using the double declining balance method. On January 1, 2021, the company determines that the total useful life is 8 years and the estimated residual value is $9,000. Required: 1. The equipment's book value at January 1,2021 is $ Round your final answer to the nearest dollar. 2. The annual depreciation expense for 2021 is \$ Roctid your final answer to the nearest dollar