Exercise 4-27 (Algorithmic) (LO. 4) Determine the taxable amount of social security benefits for the following situations. If required, round your answers to the nearest dollar. If an amount is zero, enter"0". a. Erwin and Eleanor are married and file a joint tax return. They have adjusted gross income of $40,800, no tax-exempt interest, and $14,280 of Social Security benefits. As a result, $ of the Social Security benefits are taxable. b. Assume Erwin and Eleanor have adjusted gross income of $19,000, no tax-exempt interest, and $20,900 of Social Security benefits. As a result, s 0 of the Social Security benefits are taxable. C. Assume Erwin and Eleanor have adjusted gross income of $106,000, no tax-exempt interest, and $15,900 of Social Security benefits. As a result, s of the Social Security benefits are taxable. Feedback Check My Work If a taxpayer's income exceeds a specified base amount, as much as 85 percent of Social Security gross income. The taxable amount of benefits is determined through the application of one of two income-modified adjusted gross income (MAGI)