?Barbara is single and owns a home in the city, which is her primary residence. She also owns a cottage at the beach, which she treats as a vacation home. In April $2021,$ ?she borrowed $$50,000$ ?on a home equity loan and used the proceeds to pay off credit card obligations and other debt. She paid the following in $2021$:

Mortgage interest $($personal residence$)$ ?$$15,000$

Mortgage interest $($cottage$)8,000$

Interest on the home equity loan $5,000$

Interest on credit card $2,500$

Calculate any AMT adjustment concerning interest in $2021.$