You are given some historical data on the risk characteristics of Dell and Microsoft. Dell has a beta of 2.21, while Microsoft has a beta of 1.81. The annual standard deviation of return is 49.4% for Dell and 62.7% for Microsoft. Assume the standard deviation of returns on the market was 15%. The correlation coefficient of Dell's returns versus Microsoft is 0.46. What is the standard deviation of a portfolio invested one-third in Dell, one-third in Microsoft, and one-third in risk-free Treasury bills? Input your response here in percent rounded to two decimal places but without the % sign. For example, if your answer is 8.94%, input "8.94