I plan on retiring at 70 years of age. I want to retire with a net income of $105,000 a year, total. I anticipate that social security will fund $20,000 of this total, but the social security will be taxable at 25%. The other portion is a ROTH IRA and not taxable at retirement.

Please provide the following answer: Assuming I invested in a ROTH IRA, and the IRS wants 25% of my income at retirement, how much a year beginning at 25 to age 70 will I need to set aside/invest at 11% interest to achieve my investment goal?