[Python] Dealing with functions

I ask for user input executed in main() then define another function to work out the calculation with variables assigned to the user input. In IDLE it outputs 0:

#global variables
firstClass = 0.0
businessClass = 0.0
economyClass = 0.0
soldFirstClass = 0.0
soldBusinessClass = 0.0
soldEconomyClass = 0.0
totalFC = 0.0
totalBC = 0.0
totalEC = 0.0

######################################
###########MAIN FUNCTION#############
######################################

def main():

print('***WELCOME***\n')
print('***Please ENTER the Airlines ticket prices***\n')

firstClass = float(input ('Please ENTER a ticket price for First Class: '))
businessClass = float(input ('Please ENTER a ticket price for Business Class: '))
economyClass = float(input ('Please ENTER a ticket price for Economy Class: '))

print('\nThank You\n')

soldFirstClass = float(input ('Please ENTER the number of sold tickets for First Class: '))
soldBusinessClass = float(input ('Please ENTER the number of sold tickets for Business Class: '))
soldEconomyClass = float(input ('Please ENTER the number of sold tickets for Economy Class: '))

calcClass()

def calcClass():

global firstClass, soldFirstClass, businessClass, soldBusinessClass, economyClass, soldEconomyClass

totalFC = firstClass*soldFirstClass
print('Total money earned for First Class = %0.0f ') % totalFC
totalBC = businessClass*soldBusinessClass
print('Total money earned for Business Class = %0.0f ') % totalBC
totalEC = economyClass*soldEconomyClass
print('Total money earned for Economy Class = %0.0f ') % totalEC

main()

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