Mitchell and Susan filed married/joint. They had adjusted gross income of $130,000. They had the following interest expense. The total allowable interest deduction is: Real property taxes on principal residence $5,000 Mortgage interest on principal residence $15,000 Interest expense on home equity loan to substantially improve the residence $4,000 Automobile loan interest $2,000 Home mortgage interest on a second home $3,000 Credit Card interest $1,000

Select one: a. $18,000 b. $22,000 c. $29,000 d. $19,000