Probability	Return on Stock A	Return on Stock B
Good	0.35	0.30	0.50
OK	0.50	0.10	0.10
Poor	0.15	-0.25	-0.30

Portfolios with more than one asset: Given the returns and probabilities for the three possible states listed here, calculate the covariance between the returns of Stock A and Stock B. For convenience, assume that the expected returns of Stock A and Stock B are 11.75 percent and 18 percent, respectively.