Zena is single and 68 years old and is receiving monthly income in retirement of $3,500. Calculate and show the difference in tax treatment between the following 4 alternatives: 3,500/month comes from a Roth IRA that was established in 2002 3,500/month comes from a regular IRA where all contributions were tax deductible 3,500/month comes from a life annuity that was established with an investment of $450,000 3,500/month comes from a 401(k) distribution where 109,000 of the contributions were made with previously taxed dollars.