-Software Sales- | Python Fiddle

"""======================================================================
Program:	
	Software Sales Calculator
Author:		
	Chris Brockamp
Date:		
	April 12, 2015
Dev Env:	
	Python Fiddle
Description: 
	Calculates the total cost for software packages purchased
======================================================================"""

#_declare constants______________________________________________________
PACKAGE_COST = 99	# dollars
DISCOUNT_ONE = .2
DISCOUNT_TWO = .3
DISCOUNT_THREE = .4
DISCOUNT_FOUR = .5

#_define functions_______________________________________________________
def calculate_discount(packages):
    if packages in range(10):
        return 0;
    elif packages in range(10, 20):
        return packages * PACKAGE_COST * DISCOUNT_ONE 
    elif packages in range(20, 50):
        return packages * PACKAGE_COST * DISCOUNT_TWO
    elif packages in range(50, 100):
        return packages * PACKAGE_COST * DISCOUNT_THREE
    elif packages >= 100:
        return packages * PACKAGE_COST * DISCOUNT_FOUR

def calculate_total_cost(discount):
    	return packages * PACKAGE_COST - discount

def display_discount(discount):
    print "Your discount is: $%.2f" % float(discount)
    
def display_total_cost(total_cost):
    print "Your total cost is: $%.2f" % float(total_cost)
    
#_main___________________________________________________________________
packages = input("How many software packages were purchased? ")
print packages
discount = calculate_discount(packages)
total_cost = calculate_total_cost(discount)
display_discount(discount)
display_total_cost(total_cost)

Python Fiddle

Python Cloud IDE