Problem III $(10$ points$)$

The Upjohn Company purchased new packaging equipment with an estimated useful life of five years. The cost of the equipment was $\backslash (\backslash$$ $55,000\backslash ),$ and the salvage value was estimated to be $\backslash (\backslash$$ $5,000\backslash )$ at the end of year $5.$ It was also estimated that, during its useful life, the new equipment will produce $150,000$ units in $12,000$ working hours. During the first year, the company used the new packaging equipment for $2,450$ hours to produce $23,450$ units. From the information given, compute:

$($a$)$ The annual depreciation expenses and end$-$of$-$year balance over the five$-$year life of the equipment using the straight$-$line method. $(4$ points$)$

$($c$)$ The first$-$year depreciation value using the units of production method. $(3$ points$)$

I have attached the correct solution, I want a step by step explanation about how to solve the question and get the same answer as in the answer picture.