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3. Mr. and Mrs. Keppner file a joint income tax return. Compute their standard deduction assuming that a. Mr. Keppner is age 68, and Mrs. Keppner is age 60. b. Mr. Keppner is age 70, and Mrs. Keppner is age 68. c. Mr. Keppner is age 70, and Mrs. Keppner is age 68. Mrs. Keppner is legally blind