Car Range

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The *fuel economy* of a car is the distance which it can travel on one litre of fuel. The base fuel economy (i.e, its fuel economy when there is only one person - the driver - in the car) of a certain car is $M$ kilometres per litre. It was also observed that every extra passenger in the car *decreases* the fuel economy by $1$ kilometre per litre. $P$ people want to take this car for a journey.

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