Charleen is single. She is filling out the Social Security worksheet shown on page 451 so she can determine the amount of her Social Security benefits that she will pay federal income tax on. The following lines were taken from her tax information.
• Line 1 She received $38,121 in Social Security benefits.
• Line 3 The total of her other sources of income is $23,907.
• Line 4 The amount from line 8b is $450.
• Line 6 The total to enter is $3,211.
How much of Charleen's Social Security benefit must she pay federal income tax on?