A machine which cost $700,000 is acquired on October 1, 2020. Its estimated salvage value is $70,000 and its expected life is 4 years.

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Calculate depreciation expense for 2020 and 2021 by double-declining balance. (Round answers to 0 decimal places, e.g. 5,275.)

	2020	2021
Depreciation expense	$	$

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(a2)

Calculate depreciation expense for 2020 and 2021 by sum-of-the-years'-digits. (Round answers to 0 decimal places, e.g. 5,275.)

	2020	2021
Depreciation expense	$	$