There are three possible states of the world: Bust, Normal, and Boom. There is a 20%probability of a Bust, in which case Stock A has a return of 5%and Stock Bhas a return of 6%. There is a 50probability of Normal times, in which Stock A has a return of 12%and Stock Bhas a return of 15%. And there is a 30%probability of a Boom, in which Stock $A$ has a return of $20 \%$ and Stock $B$ has a return of $25 \%$. Find the covariance between Stock $A$ and Stock $B$.