John (age 51 and single) has earned income of $3,000. He has $30,000 of unearned (capital gain)

Question:

John (age 51 and single) has earned income of $3,000. He has $30,000 of unearned (capital gain) income.
a. If he does not participate in an employer-sponsored plan, what is the maximum deductible IRA contribution John can make in 2017?
b. If he does participate in an employer-sponsored plan, what is the maximum deductible IRA contribution John can make in 2017?
c. If he does not participate in an employer-sponsored plan, what is the maximum deductible IRA contribution John can make in 2017 if he has earned income of $10,000?