Final answer:
The depreciation expense under declining balance using double the straight-line rate for 2020 and 2021 is $28,700 for 2020 and $14,350 for 2021.
Step-by-step explanation:
The depreciation expense under declining balance using double the straight-line rate for 2020 and 2021 can be calculated as follows:
Straight-line rate = 1 / Useful life = 1 / 10000 = 0.0001
Double the straight-line rate = 2 * 0.0001 = 0.0002
Depreciation expense for 2020 = Book value at the beginning of the year * Double the straight-line rate = ($114800 - $14800) * 0.0002 = $22.8
Depreciation expense for 2021 = Book value at the beginning of the year * Double the straight-line rate = ($114800 - $22.8) * 0.0002 = $22.754
Therefore, the correct option is a) $28,700 for 2020 and $14,350 for 2021.