Dicky owns and lives in his principal residence in Naperville, IL. He financed the purchase of his home through a mortgage secured by his principal residence in 2020. His balance on this mortgage is $635,000. Dicky paid mortgage interest expense of $35,600. Dicky also has a vacation home in Hawaii with a mortgage balance of $300,000 and he paid $12,000 of mortgage interest expense. Dicky also had a home equity loan secured by his principal residence of $55,000 used to pay off his daughters college tuition. He paid $2,200 of interest expense on this loan. How much interest expense is deductible by Dicky?