Question: Suppose that in the preceding problem a new airplane P3 becomes available, having an operating cost for the same trip of $15 thousand and accommodating

Suppose that in the preceding problem a new airplane P3 becomes available, having an operating cost for the same trip of $15 thousand and accommodating 40 firstclass, 40 tourist-class, and 80 economy-class passengers. If airplane P1 were replaced by airplane P3, how many of P2 and P3 should be used in order to minimize the operating cost?

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