A risky security sells for $800 today. At time , the stock price is either $865 with probability 70%, or $740 with probability 30%. A risk-free asset sells for $1000 today and will have a value of $1075 at time T. An investor has $65000 to invest today. The investor creates a portfolio by splitting the money 50/50 between the risky security and the risk-free assets. Find the amount of risk (using standard deviation of the return) on this portfolio. State your answer as a percentage rounded to two places after the decimal. = %