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100 people (or some multiple of 100) want to travel from San Diego to LA. A trip by car takes C(x) = 100 + 0.6x minutes where x is the number of people who drive. The bus from San Diego to La takes C(x) = 120 + 0.2x minutes.
Suppose each person bases her decision to drive or take the bus to minimize her own commuting time. What will the total travel time be for all 100 people?
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