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Let's represent success as S and failure as F. Since the probability of success is 70%, the probability of failure is 30%.
Therefore, the probability that all four businesses fail is:
P(F) x P(F) x P(F) x P(F)
= 0.3 x 0.3 x 0.3 x 0.3
= 0.3^4
= 0.0081
So, the probability that all four businesses fail is 0.81%.