On January $2,2021,$ Archer Company, a skateboard manufacturer, installed a computerized machine in its factory at a cost of $$170,600.$ The machine's useful life was estimated at four years or a total of $179,500$ units with a $$27,000$ trade$-$in value. Archer Company's yearend is December $31.$

Calculate depreciation for each year of the machine's estimated useful life under each of the following methods: $($Do not round intermediate calculations.$)$

a$.$ Straight$-$line

b$.$ Double$-$declining$-$balance

c$.$ Units$-$of$-$production, assuming actual units produced were:

$\backslash$table$[[$Year$,2021,2022,2023,2024],[$Units$,39,100,42,350,53,400,64,000]]$

$\backslash$table$[[$Year$,,\backslash$table$[[$traight$-],[$Line$]],,\backslash$table$[[$Double$-$Declining$-],[$Balance$]],\backslash$table$[[$Units$-$of$-],[$Production$]]],[2021,$$$,35,900,$$$,85,300,31,284x$