Required: Carl and Karina file a joint return. Karina earned a salary of $39,750 and received dividends of $3,140, taxable Interest Income of $2,070, and nontaxable interest of $1,035. Carl received $9,280 of social security benefits and a gift of $6,070 from his brother. What amount of social security benefits is taxable to Carl and Karina? Taxable social security benefits