Answer:
$5,520,000
Step-by-step explanation:
As per the data given in the question,
Cost = $6,900,000
Less: Amortization for 2 years = $1,380,000 ($6,900,000×2÷10)
Book value of patent = $5,520,000 ($6,900,000 - $1,380,000)
Undiscounted sum of future cash flows = $5,760,000 ($720,000×8)
Since the amount of book value is less than the amount of undiscounted sum of future cash flow, Therefore Patent should be carried on the Book value, So, Patent should be carried on the December 31,2021 balance sheet at $5,520,000