3. On September 1, 2020, David purchased manufacturing equipment for use in his business. The equipment cost $15,000, has an estimated useful life of 7 years, and an estimated salvage value of $1,000. No election to expense or use bonus depreciation is made. a. Calculate the amount of depreciation on the manufacturing equipment for 2020 using conventional (financial accounting, not MACRS) straight-line depreciation. (Do not use table schedule. Calculate this like you learned in accounting class) = $ $ b. Calculate the amount of depreciation on the manufacturing equipment for 2020 using the straight-line MACRS optional method. (Use table) = $ c. Calculate the amount of depreciation on the manufacturing equipment for 2020 using the accelerated MACRS method. (Use table) = $