David and Donna file a joint return. David earned $30,000 during the year before losing his job. Donna received Social Security benefits of $5,800. Requirements a. Determine the taxable portion of the Social Security benefits. b. What is the taxable portion of the Social Security benefits if David earned $46,000? 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 The taxable portion of the Social Security benefits is Requirement b. What is the taxable portion of the Social Security benefits if David earned $46,000? Begin by computing the provisional income. The provisional income is The taxable portion of the Social Security benefits is