Personal Finance - You are determined to be a disciplined investor throughout your life. You begin investing $500 per month starting January 1 after you graduate from college. You persist with this amount per month for 10 years then up the monthly amount to $1000 per month for the next 10 years. At the end of the 20th year your investment portfolio loses 10% of its total value, but you are not deterred. You start investing $2,000 per month at the beginning of 21 st year. How much will your portfolio be worth at the end of the 40th year assuming you earn an average of 8% per year