During $2016,$ Marigold Corporation spent $$154,080$ in research and development costs. As a result, a new product called the New Age Piano was patented. The patent was obtained on October $1,2016,$ and had a legal life of $20$ years and a useful life of $10$ years. Legal costs of $$28,080$ related to the patent were incurred as of October $1,2016.$ Prepare all journal entries required in $2016$ and $2017$ as a result of the transactions above. On June $1,2018,$ Marigold spent $$9,720$ to successfully prosecute a patent infringement suit. As a result, the estimate of useful life was extended to $12$ years from June $1,2018.$ Prepare all journal entries required in $2018$ and $2019.$ In $2020,$ Marigold determined that a competitor's product would make the New Age Piano obsolete and the patent worthless by December $31,2021.$ Prepare all journal entries required in $2020$ and $2021.$