Astrid originally borrowed $600,000 to acquire her home. When the balance on the original mortgage is $540,000, she purchases a ski chalet by borrowing $500,000, which is secured by a mortgage on the chalet. Astrid pays $45,000 in interest on her home mortgage and $32,000 in interest on the chalet's mortgage. What is Astrid's allowable itemized deduction for interest paid?