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I need some help with this piece of code! month=0 debt=5,000 payment=100 interest=73.50 while month<12: debt -= payment debt -= interest print debt It is telling me that -= is not valid. What am I doing wrong.

MIT 6.00 Intro Computer Science (OCW)
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Read the error message the interpreter is giving you closely. The clue you need is in there.
debt = 5,000 # wrong debt = 5000 # right
a la python shell you are creating a tuple and then trying to += (concatenate) an int to it >>> debt=5,000 >>> debt (5, 0) >>> debt+=100 Traceback (most recent call last): File "", line 1, in debt+=100 TypeError: can only concatenate tuple (not "int") to tuple as rsmith said above, get rid of the ','

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Other answers:

Don't forget that you never increase the value of month, your loop is endeless, never separate the numbers, only if they are floats. Remember also that, the interest are part of your payment, should be better if it looks like this: debt = debt - (payment+interest), that'll help if they ask you things like, total amount you paid.

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