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To find the probability that all four businesses succeed, we need to multiply the individual probabilities of success for each business.
Since each business has a 70% chance of succeeding, the probability of success for each business is 0.70.
Therefore, the probability that all four businesses succeed is:
0.70 * 0.70 * 0.70 * 0.70 = 0.70^4 = 0.2401
So, the probability that all four businesses succeed is 24.01%.