In 2016, Susan (44 years old) is a highly successful architect and is covered by an employee-sponsored plan. Her husband, Dan (47 years old), however, is a Ph.D. student and is unemployed. Compute the maximum deductible IRA contribution for each spouse in the following alternative situations.

a. Susan's salary and the couple's AGI is $190,000.The couple files a joint tax return.

b. Susan's salary and the couple's AGI is $120,000.The couple files a joint tax return.

c. Susan's salary and the couple's AGI is $80,000.The couple files a joint tax return.

d. Susan's salary and her AGI is $80,000.Dan reports $5,000 of AGI and earned income. The couple files separate tax returns.