What is the maximum IRA contribution that Josh can make under each of the following assumptions? Required: a. Josh is age 20 and single. Josh's only income item is $13,600 interest from a trust fund. b. Josh is age 40 and single. Josh's only income item is a $34,600 share of ordinary income from a partnership. c. Josh is age 60 and single. Josh's only income item is $29,000 wages. d. Josh is age 46 and files a joint return with a spouse. Josh's sole proprietorship generates a $7,390 loss, and the spouse's salary is $49,800