On August 1, 2020, a copper mining company acquired and installed a new rock crusher for $25,000,000. The crusher is used in the mine to aid in the excavation of ore. At the time of installation, management estimates that the crusher will be used for 8 years, help to mine 3 million tons of ore, and have a residual value of $1,000,000. The company has a December 31 fiscal year end. The mine's actual production through 2022 was as follows: Year Tons of ore mined 2020 150,000 2021 400,000 2022 350,000 1. (DEPRECIATION METHODS] a. What is accumulated depreciation for the rock crusher as of December 31, 2021 assuming the company uses straight-line depreciation Show your work. Response: b. What is depreciation expense for the rock crusher in 2020 assuming the company uses the units- of-production method? Show your work. Response: C. What is the book value of the rock crusher as of December 31, 2021 assuming the company uses the double-declining-balance depreciation method? Show your work (use the grid provided if +you like). Response