John (age 57 and single) has earned income of $4,200. He has $32,900 of unearned (capital gain) income. (Omit the "$" sign in your response.) a. If he does not participate in an employer-sponsored plan, what is the maximum deductible IRA contribution John can make in 2012? Deductible IRA contribution $ b. If he does participate in an employer-sponsored plan, what is the maximum deductible IRA contribution John can make in 2012? Deductible IRA contribution $ c. If he does not participate in an employer-sponsored plan, what is the maximum deductible IRA contribution John can make in 2012 if he has earned income of $14,600? Deductible IRA contribution $