URGENT!!! Please solve ASAP

9. The Kingdom of the North decides to start a stock market. At the start of the year all shares are worth exactly one pound and Rosie creates a portfolio of shares in 100 different stocks, with an equal number of shares in each stock. At the end of the year she notices that her portfolio has not changed in value in aggregate, but that the standard deviation of the stock returns in her portfolio is exactly 10p. She calculates the weight of each stock in her portfolio (i.e. the proportion of the total portfolio value which the holdings in it represent) at the end of the year. She wonders how a different portfolio would have performed, if each stock in it had had its start of year weight equal to that same stock's end of year weight in her initial portfolio. Can you calculate how the value of this new portfolio would have changed over the year? 9. The Kingdom of the North decides to start a stock market. At the start of the year all shares are worth exactly one pound and Rosie creates a portfolio of shares in 100 different stocks, with an equal number of shares in each stock. At the end of the year she notices that her portfolio has not changed in value in aggregate, but that the standard deviation of the stock returns in her portfolio is exactly 10p. She calculates the weight of each stock in her portfolio (i.e. the proportion of the total portfolio value which the holdings in it represent) at the end of the year. She wonders how a different portfolio would have performed, if each stock in it had had its start of year weight equal to that same stock's end of year weight in her initial portfolio. Can you calculate how the value of this new portfolio would have changed over the year