A machine is purchased on May $1,$ Year $1.$ The machine is expected to be obsolete after five years $(60$ months$)$ and, thereafter, no longer useful to the company.

Additional information regarding the machine is as follows.

a$.$ Compute depreciation expense for both Year $1$ and Year $2$ under the straight$-$line method.

Year $1$:

b$.$ Compute depreciation expense for both Year $1$ and Year $2$ under the double$-$declining$-$balance.

Year $1$:

Year $2$: