Question 886853
" the two events are independent", so 


P(A and B) = P(A)*P(B)


P(A and B) = 0.20*0.50


P(A and B) = 0.10


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Now use this to find the probability of P(A or B)



P(A or B) = P(A) + P(B) - P(A and B)


P(A or B) = 0.20 + 0.50 - 0.10


P(A or B) = 0.70 - 0.10


P(A or B) = <font color="red">0.60</font>