Sale of principal residence. Adam is single and has no dependents. On January $1,2012,$ Adam began renting a house and using it as his principal residence. On January $1,2018,$ Adam purchased the house for $$320,000.$ He continued to live there as his principal residence until November $30,2019,$ when he sold the house for $$380,000$ and immediately moved out. No unforeseen circumstances were involved. How much capital gain did Adam have to report on his $2019$ return for this sale?