Answer: $10,000
Explanation: Amortization expense is writing off of the intangible asset over its estimated useful life. It reflects the part of that intangible asset that is consumed over that period of time.
While computing amortization useful life should be taken into consideration and not its legal life. It can be computed as follows under straight line method :-
[tex]=\:\frac{book\:value\:-residual\:value}{useful\:life}[/tex]
[tex]=\:\frac{50,000\:-0}{5}[/tex]
= $10,000
