please explain how to get part b. Ive been using (Asset value - residual)umber of units. I can't get the right answer please explain it in detail if you can.

On January 1, 2017, Northeast USA Transportation Company purchased a used aircraft at a cost of $44,700,000. Northeast USA expects the plane to remain useful for five years (7,300,000 miles) and to have a residual value of $4,700,000. Northeast USA expects to fly the plane 925,000 miles the first year, 1,650,000 miles each year during the second, third, and fourth years, and 1,425,000 miles the last year. Read the requirements. 1. Compute Northeast USA's depreciation for the first two years on the plane using the straight-line method, the units-of-production method, and the double-declining balance method. a. Straight-line method Using the straight-line method, depreciation is $ 8,000,000 for 2017 and $ 8,000,000 for 2018. i X Requirements b. Units-of-production method (Round the depreciation per unit of output to two decimal places to compute your final answers.) Using the units-of-production method, depreciation is $ 5.48 for 2017 and $ for 2018. 1. Compute Northeast USA's depreciation for the first two years on the plane using the following methods: a. Straight-line method b. Units-of-production method (round depreciation per mile to the closest cent) c. Double-declining-balance method 2. Show the airplane's book value at the end of the first year under each depreciation method. Print Done