user input and output

[j.crater]

I don't know what exactly you want printed, but something like this maybe for a start:

print("Your family spends $" + str(costs) + " on food per month?")

Or a bit more elegant:

print("Your family spends ${0:.2f} on food per month?".format(costs))

See details about input/output formatting here: https://docs.python.org/3/tutorial/inputoutput.html