I need help with the last question:

The taxable portion of the Social Security benefits is

Derrick and Delores file a joint return. Derrick earned $31,000 during the year before losing his job. Delores received Social Security benefits of $4,400. Requirements Determine the taxable portion of the Social Security benefits. b. What is the taxable portion of the Social Security benefits if Derrick earned $51,000? a. 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.) Adjusted gross income (excluding Social Security benefits) 31,000 Plus: 50% of Social Security benefits 2,200 $ 33,200 Provisional income $ 600 The taxable portion of the Social Security benefits is Requirement b. What is the taxable portion of the Social Security benefits it Derrick earned $51,000? Begin by computing the provisional income. The provisional income is $ 53,200 The taxable portion of the Social Security benefits is