stupidly easy hw that I need help with

[icantcodeforcrap]

This is my window. I'm using cloud9.

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Now it's behaving differently. I don't know what made it change. I also altered my code, but I'm still getting the same final answer.

tax = .06

# How much is the bill?
bill = input("How much is the bill? ")

# What percentage of the tip would you like to enter?
tippy = input("What percentage of the tip would you like to enter? ")

# Tip added
print "Tip added is " + str(tippy)

# What is the total bill?
TotalBill = (bill * tax) + (bill * (tippy / 100)) + bill
print "Your total bill is " + str(TotalBill) 

Output:
How much is the bill? 100
What percentage of the tip would you like to enter? 10
Tip added is 10
Your total bill is 106.0