PYTHON
Allenton Water Department wants a program that calculates a customer's monthly water bill. The clerk will enter the current and previous meter readings.
The program should calculate and display the number of gallons of water used and the total charge for the water.
The charge for water is $7 per 1,000 gallons.
The water company has a mandatory minimum that each customer must pay at least $16.67, even if their bill is lower than the minimum cost. (In other words, every customer must pay at least $16.67).