ANSWER
Loss of $1000
EXPLANATION
Cost is $50000
The less accumulated depreciation is $45000
Hence, the book value on data on sale;
[tex]\begin{gathered} 50000-45000 \\ =5000 \end{gathered}[/tex]Gain or loss on sale = Sale value - Book value;
[tex]\begin{gathered} 4000-5000 \\ =-1000 \end{gathered}[/tex]Therefore a loss