What is the maximum IRA contribution that Josh can make under each of the following assumptions?

Required:

Josh is age $20$ and single. Josh's only income item is $$13,900$ interest from a trust fund.

Josh is age $40$ and single. Josh's only income item is a $$36,200$ share of ordinary income from a partnership.

Josh is age $60$ and single. Josh's only income item is $$29,700$ wages.

Josh is age $46$ and files a joint return with a spouse. Josh's sole proprietorship generates a $$7,320$ loss, and the spouse's salary is $$40,800.$