Year $1$ Jan. $5$ Purchased for $\backslash (\backslash$$ $15,600\backslash )$ cash a new machine with an estimated useful life of four years and a salvage value of $\backslash (\backslash$$ $3,600\backslash ).$ Dec. $31$ Recorded depreciation on the machine for the year. Year $2$ May $1$ Installed a set of attachments for the machine at a cost of $\backslash (\backslash$$ $800\backslash )$ cash. The attachments are expected to increase the productivity of the machine over its remaining useful life, but will not increase the salvage value of the machine. Dec. $31$ Recorded depreciation on the machine for the year. Year $3$ Dec. $31$ Recorded depreciation on the machine for the year. Basin's depreciation policies include: $(1)$ using straight$-$line depreciation, $(2)$ recording depreciation to the nearest whole month, $(3)$ expenditures for betterments that enhance the productivity of an asset are added directly to the asset account Required: Note: Round to the nearest dollar. Input your answer without any $"\backslash$$$"$ or $",".$ For example, if the answer is $\backslash (\backslash$$ $5,600\mathrm{.}03\backslash ),$ enter $5600.$ If the answer is $\backslash (-\backslash$$ $73,548\mathrm{.}70\backslash ),$ enter $\backslash (-73549\backslash ).$ Based on these transactions: a$.$ Depreciation expense for each of the three years: Year $1=\backslash$$ Year $2=\backslash (\backslash$$ $\backslash )$ Year $\backslash (3=\backslash$$ $\backslash )$ b$.$ Book value of the delivery machine at the end of year $\backslash (3=\backslash$$ $\backslash )$