Doug and Donna file a joint return. Doug earned $36,000 during the year before losing his job. Donna received Social Security benefits of $5,000. Requirements a. Determine the taxable portion of the Social Security benefits. b. What is the taxable portion of the Social Security benefits if Doug earned $43,000? Requirement a. Determine the taxable portion of the Social Security benefits. Begin by computing the provisional income. Only select iems that are applicable to Dan and Diana. (Leave unused cells blank, do not select a label or enter a zero.) Plus: Provisional income 50% of Social Security benefits Adjusted gross income (excluding Social Security benefits) Excluded foreign income Gross income Social security benefits Tax-exempt interest Word Bank