#!/usr/bin/env python
#
# Author  : Ahmed Obied (amaobied@ucalgary.ca)
# Date    : Jan. 17th 2008
# Purpose : Determines the amount of tax charged (based on a 7% rate)
#           and the total dollar value to be paid by a customer for
#           a given retail value. Also it determines the amount of
#           change that is owed to the customer.     
#

# constant for the GST 
GST = 1.07

# the amount of the item that is purchased by the customer
retail_price = float(raw_input('Enter the amont of the item that is purchased in CND $'))

# calculate the amount purchased with the GST
total = GST * retail_price

# print the total amount the user owes us including GST
print 'The total amount the customer owes us is $%.2f' % total

# enter the amount the customer pays
amount_paid = float(raw_input('Enter the amount the customer has paid in CND $'))

# calculate the owed amount
change = amount_paid - total

# print it to the console with proper formatting
print 'Change owed to the customer $%.2f' % change