Chapter 10 Counting Methods and Probability - 10.4 Find Probabilities of Disjoint and Overlapping Events - 10.4 Exercises - Problem Solving - Page 712: 47a

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40% of the tomatoes are partially rotten 30% of the tomatoes have been fed on by insects 12% are partially rotten and have been fed on by insects. Substituting into the formula $P(A orB)=P(A)+P(B)-P(AandB)$ we have: $0.4+0.3-0.12=0.58=58\%$ The probability that a randomly selected tomato is partially rotten or has been fed on by insects is $58\%$