Erwin and eleanor are married and file a joint tax return. they have adjusted gross income of $38,200, no tax-exempt interest, and $13,370 of social security benefits. as a result, $ of the social security benefits are taxable. b. assume erwin and eleanor have adjusted gross income of $17,200, no tax-exempt interest, and $18,920 of social security benefits. as a result, $ of the social security benefits are taxable. c. assume erwin and eleanor have adjusted gross income of $89,500, no tax-exempt interest, and $13,425 of social security benefits. as a result, $ of the social security benefits are taxable.