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

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40% of the tomatoes are partially rotten. 20% of the tomatoes have bite marks from a chipmunk. 7% have bite marks and are partially rotten. Substituting into the formula $P(A orB)=P(A)+P(B)-P(AandB)$ we have: $0.4+0.2-0.07=0.53=53\%$ The probability that a randomly selected tomato has bite marks or is partially rotten is $53\%$.