Albatross Company purchased a piece of machinery for $60,000 on January 1, 2019, and has been depreciating the machine using the double-declining-balance method based on a five-year estimated useful life and no salvage value. On January 1, 2021, Albatross decided to switch to the straight-line method of depreciation. The salvage value is still zero and the estimated useful life did not change. Ignore income taxes. Required:
a. What type of accounting change is this, and how should it be handled?
b. Prepare the journal entry to record depreciation for 2017. Show all calculations clearly.

Caleb construction (cc) incurs supervisor salaries expense in the construction of homes. if cc manufactures 100 homes in a year, fixed supervisor salaries will be $400,000. with the current construction supervisors, cc's productive capacity is 150 homes in a year. however, if cc is contracts to build more than 150 homes per year, it will need to hire additional supervisors, which are hired as full-time rather than temporary employees. cc's productive capacity would then become 200 homes per year, and salaries expense would increase to $470,000. how would cc’s salaries expense be properly classified? fixed variable mixed stepped curvilinear