b$\backslash$A company has been depreciating equipment using a $10-$year life on a straight$-$line basis. The equipment, which costs $$67,200,$ was purchased on January $1$ of Year $1.$ The equipment has an estimated residual value of $$16,800.$ On January $1$ of Year $5,$ management decides to depreciate the equipment over a total life of $14$ years instead of $10,$ with no change in the estimated residual value. The annual financial statements are prepared on a comparative basis $($Year $4$ and Year $5$ are presented$).$ Income before depreciation for Year $4$ and Year $5$ was $$139,440$ and $$147,840,$ respectively. Ignore income tax.

Required

a$.$ Prepare the journal entries to be recorded in Year $1$ through Year $4$ for annual depreciation.