What is the maximum IRA contribution that Mr. Janson can make under each of the following assumptions? a. He is age 20 and single. His only income item is $13,400 interest from a trust fund. b. He is age 40 and single. His only income item is a $32,000 share of ordinary income from a partnership c. He is age 60 and single. His only income item is $27,200 wages from his job. d. He is age 46 and files a joint return with his wife. His sole proprietorship generates a $7,230 loss, and his wife's salary is $49,600 Answer is complete but not entirely correct. a. Maximum contribution $ 5,000 b. Maximum contribution $31,900 c. | Maximum contribution $10,000 d. Maximum contribution 30,000