Indigo Corporation purchases a patent from Sandhill Company on January 1, 2020, for $54,000. The patent has a remaining legal life of 12 years. Indigo feels the patent will be useful for 10 years. Prepare Indigos journal entries to record the purchase of the patent and 2020 amortization. (Credit account titles are automatically indented when amount is entered. Do not indent manually. If no entry is required, select "No Entry" for the account titles and enter 0 for the amoun