6. Starting from a balance of $10,000 in year 0 in a stock brokerage account, your net rates of returns are 50% in year 1, and 40% in year 2. (a) How much do you have by year 2 ? (b) What's the expected annual rate of return if you continue in year 3 ? (c) What's the standard deviation of your returns? (d) In the past two years, how much on average do you gain or lose on an annual basis