South Airlines purchased a 747 aircraft on January 1, 2019, at a cost of $35,000,000. The estimated useful life of the aircraft is 20 years, with an estimated salvage value of $5,000,000. Instructions

(a) Compute the depreciation for 2019 and 2020 using the straight-line method and the double-declining-balance method.

(b) under each method, what is the book value after two years on December 31, 2020?