Assume you make $50,000 per year. You expect your pay to increase by 2.5% year from now until you retire in 30 years. Your goal is to withdraw an amount equal to 80% of your annual income at retirement each year for 25 years (assume withdrawals are made at the end of each year in retirement). How much would you have to invest each year from now until retirement if your investment returns are 8% per year while working and 6% per year while retired.