In 2015, Fred and Elizabeth, who are married and filing jointly, received $29,000 in social security benefits.

In 2015, Fred and Elizabeth, who are married and filing jointly, received $29,000 in social security benefits. Their AGI (excluding social security) is $36,000 and they received $12,000 in tax-exempt interest income. How much of their social security must they include in gross income in 2015? Show your work or no credit will be given. Use the Simplified Taxable Social Security Worksheet as your format.