finance calculate covariance with these info

You have been provided with the following information for two stocks: State of Economy Probability Return on A Return on B Recession 30% -5% 10% Normal 60% 15% 7% Boom 10% 35% -8% You have also calculated the expected return on A as 11.00%; the expected return on B as 6.40%. Calculate the covariance between stocks A and B.