Problem Specification:

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A cab company needs a program to calculate the fare for a cab ride.

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$$ The user will enter the length of the trip in miles. Create a function that returns a value greater than zero to get this value from the user.

$$ Create a function to calculate the charge. The function should receive one argument, the length of the trip, and should return the total fare for the ride.

$$ The taxi fare is a fixed charge of $$2\mathrm{.}50,$ plus an additional charge of $$1\mathrm{.}75$ per mile.

$$ Display the trip fare formatted for currency.

$$ Allow the user to calculate any number of trips.

$$ At the end display the total of all the fares.