For 2020, 2021 and 2022, calculate the current year's depreciation, balance in accumulated depreciation and book value assuming the machine was purchased on January 1, 2020 using the (a) double declining method (b) straight line methods.

For 2020, 2021 and 2022, calculate the current year's depreciation, balance in accumulated depreciation and book value assuming the machine was purchased on August 1 , 2020 using the (a) double declining method (b) straight line methods.

For 2020 calculate the current year's depreciation, balance in accumulated depreciation and book value assuming the machine was purchased on August 1 , 2020 using the units of activity method.