Brittany plans to invest 75 percent of her funds in the common stock of Unity Software Inc. and 25 percent in AbbVie Corporation. The standard deviation of returns for Unity Software Inc. is 40 percent and for AbbVie Corporation is 32 percent. The correlation between the returns for Unity Software Inc. and AbbVie Corporation is -0.8 (negative 0.8 ). Determine the standard deviation of returns for Brittany's portfolio. 38.00%5.80%24.08%27.71%