Jefferson Co$.$ purchased a machine on January $1,$ Year $6.$ The machine cost $$576,000.$ It had an estimated life of ten years or $30,000$ units, and an estimated residual value of $$40,000.$ In Year $6,$ Jeffries produced $4,000$ units.

Compute the depreciation charge for Year $6$ using each of the following methods: When required, round your answers to the nearest dollar.

Depreciation

a$.$ Double$-$declining$-$balance method

b$.$ Activity method $($units of output$)$

c$.$ Sum$-$of$-$the$-$years'$-$digits method

d$.$ Straight$-$line method

$ $q,$

$

$ $$

$