Margaret Lindley paid $15,080 of interest on her $300,800 acquisition debt for her home (fair market value of $500,800), $4,080 of interest on her $30,080 home-equity debt used to buy a new boat and car, $1,080 of credit card interest, and $3,080 of margin interest for the purchase of stock. Assume that Margaret Lindley has $10,080 of interest income this year and no investment expenses. How much of the interest expense may she deduct this year?