can you please help me answer(3) thank you'

Question 5 0/4 poln Seasons Limited paid $135,000 to purchase equipment at the beginning of 2019. Seasons Limited estimated the useful life of the equipment to be 5 years or 200,000 units. The equipment will be considered fully depreciated when the balance in the accumulated Depreciation account reaches $120,000. The equipment produced 52,000 units in 2020. Required: a. Determine the estimated residual value of the equipment. b. What is the depreciable cost of the equipment? c. Calculate depreciation expense for 2020 under the double-declining balance method