How much of this interest is deductible as "qualified residence interest"?

Gene owns his own home, which he bought several years ago. His original mortgage, which was used to buy the house, is $150,000. In the current year, he obtains a home equity loan on the house of $90,000. The interest on the original mortgage is $15,000 and on the new loan is $10,000. The fair market value of the house is $325,000. How much of this interest is deductible as "qualified residence interest?"