6.s090Electric Bill
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Description
An electric company charges for monthly electricity usage each month based on usage, according to the following rules:
- Each of the first 500 kilowatt-hours used costs $0.50 / kWh
- The next 1000 kilowatt-hours used cost $0.72 / kWh
- The next 1000 kilowatt-hours used cost $1.16 / kWh
- Every kilowatt-hour beyond 2500 costs $1.98 / kWh
In addition, an additional fee of 20 dollars is always added to the bill. For an example, if you use 50 kwh, then the charges should be 0.50 * 50 + 20 = 45.00.
Write a program that computes the total amount owed, in dollars, at the end of a month, based on the number of kilowatt-hours used.
def calculate_bill(kwh_used):
# calculate and return a final electric bill based on number of kwh_used
pass # replace this line and start your code here
if __name__ == "__main__":
# Testing: insert your test cases here
print("Example test case: 250 kwh_used expected bill: __")
calculate_bill(250)
Your program should return a single number representing the total amount owed (including the surcharge). Even though American currency doesn't quite work this way, you don't need to worry about rounding your result to the nearest cent (i.e. fractional cents are okay).
Notes
Testing
Make sure to write and test your code by hand before using Python. Draw environment diagrams for a few different test cases (one with less than 500 kWh used, one between 500 and 1500 kWh, one between 1500 and 2500 kWh, and one about 2500 kWh).
Then run your code with Python on your own machine as a test.
Submission
When you are ready (once you have simulated by hand and are convinced that your program will do the right thing), upload your file below for testing:
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