Hart Inc. purchased a patent in January of Year $1$ for $$60,000$ and chose to amortize the patent over its useful life of $20$ years. However, in Year $6,$ the

company decided that the total useful life of the patent would only be $10$ years based on new technology advances in the company's internal research and

development department.

a$.$ What is the carrying value of the patent on January $1$ of Year $6?$

Carrying value on January $1$ of Year $6$:$

b$.$ What entry would the company record for amortization of the patent in Year $6?$

Note: If a journal entry isn't required on any of the dates shown, select $"$N$/$A$$debit$"$ and $"$N$/$A$$credit$"$ as the account names and leave the Dr$.$ and Cr$.$

answers blank $($zero$).$