Exercise 130 A machine cost $900,000 on April 1, 2017. Its estimated salvage value is $90,000 and its expected life is eight years.

Calculate the depreciation expense by straight-line for 2017.

Depreciation expense $

Calculate the depreciation expense by double-declining balance for 2018.

Depreciation expense $

Calculate the depreciation expense by sum-of-the-years'-digits for 2018.

Depreciation expense $

Which method would result in the smallest income amount for 2018?