Carl and Karina file a joint return. Karina earned a salary of $$41,000$ and received dividends of $$3,240,$ taxable interest income of $$2,120,$ and nontaxable interest of $$1,060.$ Carl received $$9,480$ of social security benefits and a gift of $$6,120$ from his brother. What amount of social security benefits is taxable to Carl and Karina?

Taxable social security benefits