I got this wrong

Corporation E acquired a patent worth $900,000. The patent has a useful life of 10 years. After the third year (36 months), it was determined that the patent's value was impaired in the amount of $100,000, over and above the amount of amortization taken during the 36 month period. What is the new monthly amortization (after impairment) for the remainder of the patent's life? Answer: 9,523.81