from the solution of this question, I do not understand the 150% dclining balance schedule, why the year 2018 and 2019, depreciation expenses are using straight-line?

LO9-3 EXERCISE 9.4 Depreciation Methods On January 2, 2015, Jatson Corporation acquired a new machine with an estimated useful life of five years. The cost of the equipment was $40,000 with an estimated residual value of S5,000. a. Prepare a complete depreciation table under the three depreciation methods listed below. Use a format similar to the illustrations in Exhibits 9-4, 9-5, and 9-6. In each case, assume that a full year of depreciation was taken in 2015. 1. Straight-line. 2. 200 percent declining-balance. 3. 50 percent declining-balance with a switch to straight-line when it will maximize depre- ciation expense