I expect to be retired for about 20 years (240 months). I expect to earn 6% APR compounded monthly (after-tax) on my investments during my retirement years and I also expect inflation to average about 1.8% annually (compounded monthly). How much do I need to have saved to be able to spend the equivalent of $10,000 per month during each month of my retirement (note that you will be able to spend $10,000 during the first month of retirement and this amount will increase each month to keep my purchasing power at $10,000 dollars)?