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Question 24 of 30. Bob (69) and Carol (67) are married and file a joint return. Their gross income (including 1/2 of their social security for 2018 was $48,050. Choose the response that best completes this sentence. Up to of the soci may be taxable. O 0% 50% O 85% O 100% Mark for follow up Question 25 of 30. Melanie, age 66, files single. In 2018, she earned $20,000 in wages and $1,500 in taxable interest income. She received $11,500 in social security benefits. Choose the response that best completes this sentence. Up to o f her social security benefits may be taxable. O 0% O 50% 85% O 100% Mark for follow up