Оплата Минимальный

Question

Я, кажется, застрял на этом вопросе в MIT 6.00SC курс. Я очень новичок в программировании.

Вопрос: Проблема 1 Напишите программу для расчета остатка по кредитной карте через год, если человек платит только ежемесячный платеж , необходимый каждой кредитной карте. Использование raw_input(), чтобы задать для следующих трех чисел с плавающей точкой:

1. непогашенный остаток на кредитной карте
2. годовая процентная ставка
3. минимальная месячная ставка оплаты

Для каждого месяца , напечатайте минимальный ежемесячный платеж, оставшийся остаток, принцип оплаты в формате , указанный в приведенных ниже примерах тестирования. Все номера должны округляться до ближайшего копейки. Наконец, распечатайте результат, который должен включать общую сумму, уплаченную в этом году, и оставшийся остаток .

Вот мой новый код:

outstand_balance = float(raw_input('Enter the outstanding balance on your credit card:')) 
ann_interest_rt = float(raw_input('Enter the annual credit card interest rate as a decimal:')) 
min_month_rt = float(raw_input('Enter the minimum monthly payment as a decimal:')) 
Month = int(1) 
for month in range (0,12): 
    Min_monthly_payment = round((min_month_rt * outstand_balance), 2) 
    Interest_paid = round((ann_interest_rt/12 * outstand_balance), 2) 
    Principle_paid = round((Min_monthly_payment - Interest_paid), 2) 
    outstand_balance = round((outstand_balance - Min_monthly_payment), 2) 
    Remaining_balance = round((outstand_balance - Min_monthly_payment) * (1 \+(ann_interest_rt/12)), 2) 
    Month +=1 
    print "Minmimum monthly payment $" + str(Min_monthly_payment) 
    print "Principle Paid $" + str(Principle_paid) 
    print "Remaining Balance $" + str(Remaining_balance) 
    print "Month: " + str(Month) 

Это приводит к следующим образом:

Enter the outstanding balance on your credit card:4800 
Enter the annual credit card interest rate as a decimal:.2 
Enter the minimum monthly payment as a decimal:.02 
Minmimum monthly payment $96.0 
Principle Paid $16.0 
Remaining Balance $4684.8 
Month: 2 
Minmimum monthly payment $94.08 
Principle Paid $15.68 
Remaining Balance $4591.1 
Month: 3 
Minmimum monthly payment $92.2 
Principle Paid $15.37 
Remaining Balance $4499.28 
Month: 4 
Minmimum monthly payment $90.35 
Principle Paid $15.05 
Remaining Balance $4409.3 
Month: 5 
Minmimum monthly payment $88.55 
Principle Paid $14.76 
Remaining Balance $4321.11 
Month: 6 
Minmimum monthly payment $86.78 
Principle Paid $14.47 
Remaining Balance $4234.68 
Month: 7 
Minmimum monthly payment $85.04 
Principle Paid $14.17 
Remaining Balance $4149.99 
Month: 8 
Minmimum monthly payment $83.34 
Principle Paid $13.89 
Remaining Balance $4066.99 
Month: 9 
Minmimum monthly payment $81.67 
Principle Paid $13.61 
Remaining Balance $3985.66 
Month: 10 
Minmimum monthly payment $80.04 
Principle Paid $13.34 
Remaining Balance $3905.94 
Month: 11 
Minmimum monthly payment $78.44 
Principle Paid $13.07 
Remaining Balance $3827.82 
Month: 12 
Minmimum monthly payment $76.87 
Principle Paid $12.81 
Remaining Balance $3751.27 
Month: 13 

Вот что у них есть:

Enter the outstanding balance on your credit card: 4800 
Enter the annual credit card interest rate as a decimal: .2 
Enter the minimum monthly payment rate as a decimal: .02 
Month: 1 
Minimum monthly payment: $96.0 
Principle paid: $16.0 
Remaining balance: $4784.0 
Month: 2 
Minimum monthly payment: $95.68 
Principle paid: $15.95 
Remaining balance: $4768.05 
Month: 3 
Minimum monthly payment: $95.36 
Principle paid: $15.89 
Remaining balance: $4752.16 
Month: 4 
Minimum monthly payment: $95.04 
Principle paid: $15.84 
Remaining balance: $4736.32 
Month: 5 
Minimum monthly payment: $94.73 
Principle paid: $15.79 
Remaining balance: $4720.53 
Month: 6 
Minimum monthly payment: $94.41 
Principle paid: $15.73 
Remaining balance: $4704.8 
Month: 7 
Minimum monthly payment: $94.1 
Principle paid: $15.69 
Remaining balance: $4689.11 
Month: 8 
Minimum monthly payment: $93.78 
Principle paid: $15.63 
Remaining balance: $4673.48 
Month: 9 
Minimum monthly payment: $93.47 
Principle paid: $15.58 
Remaining balance: $4657.9 
Month: 10 
Minimum monthly payment: $93.16 
Principle paid: $15.53 
Remaining balance: $4642.37 
Month: 11 
Minimum monthly payment: $92.85 
Principle paid: $15.48 
Remaining balance: $4626.89 
Month: 12 
Minimum monthly payment: $92.54 
Principle paid: $15.43 
Remaining balance: $4611.46 
RESULT 
Total amount paid: $1131.12 
Remaining balance: $4611.46 

Почему мой номер не то же самое?

Answer 1

Вам необходимо обновить непогашенную переменную баланса на итерации, потому что в противном случае она не изменится.