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Dust
In PS 1A what is the significance of the ',2' in # Minimum monthly payment of balance at start of the month minPayment = round(minMonthlyPaymentRate * balance,2) Also, what is '+=' ?
In Python, the `,2' in the round function is the number of digits after the decimal point ( http://docs.python.org/2/library/functions.html#round). And `a += 2' means `a = a + 2'.