Doug and Diane file a joint return. Doug earned $31,000 during the year before losing his job. Diane received Social Security benefits of $5,800. Requirements Determine the taxable portion of the Social Security benefits. a. b. What is the taxable portion of the Social Security benefits if Doug earned $50,000? Requirement a. Determine the taxable portion of the Social Security benefits. Begin by computing the provisional income. Only select items that are applicable to Dan and Diana. (Leave unused input fields 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 Doug earned $50,000? Begin by computing the provisional income. The provisional income is The taxable portion of the Social Security benefits is