4. (25 points) Calculate the 5-day 90% Value at Risk (VaR) for the stock whose historical price information is given below by using historical simulation approach. Week Stock Price 0 49.00 48.12 2 47.37 3 50.25 4 51.75 5 53.12 6 53.00 7 51.87 8 51.38 9 53.00 10 49.88