Refer to the table below: 3 Doors Inc. Down Co. Expected return, E(R) 15% 9% Standard deviation, a 12% 6% Correlation -0.15 What is the standard deviation for a portfolio that invests 40% in 3 Doors, Inc. and the rest in Down Co.? Enter your answer as a percentage rounded to two decimal places. For example, if your answer is 5.45%, enter 5.45