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<h2>The revenue will be maximum for 253 passengers.</h2>Step-by-step explanation:
Let, the number of passenger is x, which is more than 194.
In this case, the travel agency will charge [312 - (x - 194)] per passenger.
The total revenue will be .
As x is the variable here, we can represent the revenue function by R(x). Hence, .
The revenue will be maximum when .