5. Nested Structures¶

Consider the telephone company “Chao”. Below 200 minutes, the company charges $0.20 per minute. Between 200 and 400 minutes, the price is $0.18. Above 400 minutes, the price per minute is $0.15. Calculate your phone bill with these conditions.
The company’s conditions can be visually represented by the path of a road like the following image.

	1	minutes = 800
	2	if minutes < 200:
	3	price = 0.20
	4	else:
	5	if minutes <= 400:
	6	price = 0.18
	7	else:
	8	price = 0.15
	9	print("Telephone bill : $%6.2f" % (minutes * price))

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Note the double indentation to satisfy the second condition.
Now we modify the “Chao” company program for a promotion where the rate is $0.08 when you use more than 800 minutes.

	1	minutes = 1000
	2	if minutes < 200:
	3	price = 0.2
	4	else:
	5	if minutes <= 400:
	6	price = 0.18
	7	else:
	8	if minutes <= 800:
	9	price = 0.15
	10	else:
	11	price = 0.08
	12	print("Telephone bill : $%6.2f" % (minutes * price))

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