Can someone please help me with this question, I've been stuck on it for awhile now! :-(

On January 2, 2016, David Corporation purchased a patent for $510,000. The remaining legal life is 10 years, but the company estimated that the patent will be useful only for six years. In January 2018, the company incurred legal fees of $80,000 in successfully defending a patent infringement suit. The successful defense did not change the companys estimate of useful life.

Required:

Prepare journal entries related to the patent for 2016, 2017, and 2018.

• Record the purchase of the patent.
• Record amortization of the patent for the year 2016.
• Record amortization of the patent for the year 2017
• Record costs of successfully defending the patent infringement suit
• Record amortization of the patent for the year 2018.