First find the probability that Andy will lose the first lawsuit: 100% - 30% = 70%
Then multiply that probability by the probability he loses the second lawsuit: 70% * 50% = 35%
Then multiply the probabilities of Andy winning each lawsuit to find the probability he wins them both: 30% * 50% = 15%
Then subtract the probability Andy wins both lawsuits from the probability he loses both lawsuits to find the difference: 35% - 15% = 20%
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