Blue Corp. purchased machinery on January $1,2019$ for $$436,000.$ Straight$-$line depreciation is used. At the time management estimated that the machinery would be used over $10$ years and would have a residual value of $$57,000.$ It is now December $31,2023$ and management has determined that the machine's life is now a total of $12$ years with no residual value. No adjusting journal entries have been recorded yet for the $2023$ year$-$end.

$($a$)$

Identify the type of accounting change and the treatment for this change.

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