anonymous
  • anonymous
Prob1c, RemainingBalance = (RemainingBalance*(1 + MonthlyRate)) - Payment Gives me 26956.44 for a monthly payment, but test case in handout shows 29643.05
MIT 6.00 Intro Computer Science (OCW)
chestercat
  • chestercat
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TuringTest
  • TuringTest
please show your whole code
anonymous
  • anonymous
## a credit card program that calculates the minimum fixed monthly payment needed in order to pay off a credit card balance within 12 months. ## this more complicated version uses a bisection search method and upper and lower bounds InitialBalance = float(raw_input('What is the outstanding balance?')) apr = float(raw_input('What is the annual interest rate?')) MonthlyRate = apr/12.0 PaymentLow = InitialBalance/12.0 PaymentHigh = (InitialBalance * (1 + MonthlyRate)**12.0)/12.0 Payment = (PaymentLow + PaymentHigh)/2.0 RemainingBalance = InitialBalance while ((RemainingBalance > 0.010) or (RemainingBalance < -0.010)): RemainingBalance = InitialBalance for i in range(12): RemainingBalance = (RemainingBalance*(1 + MonthlyRate)) - Payment if RemainingBalance > 0.010: PaymentLow = Payment Payment = (Payment + PaymentHigh)/2.0 if RemainingBalance < -0.010: PaymentHigh = Payment Payment = (Payment + PaymentLow)/2.0 print ('Monthly payment to pay off debt in 1 year: ' + str(round(Payment,2))) print ('Balance: ' + str(round(RemainingBalance,2)))
TuringTest
  • TuringTest
your formula to update the balance is wrong: RemainingBalance = (RemainingBalance*(1 + MonthlyRate)) - Payment payment needs to be subtracted before multiplication by 1+MonthlyRate

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anonymous
  • anonymous
I don't think that's correct. If you look at the handout (http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-00sc-introduction-to-computer-science-and-programming-spring-2011/unit-1/lecture-4-machine-interpretation-of-a-program/MIT6_00SCS11_ps1.pdf) I'm using the same formula.
TuringTest
  • TuringTest
that link is not working for me, but I did the same problem once on OCW and once for edX so I think mine is right did you try it to see if you get the right answer
TuringTest
  • TuringTest
?
anonymous
  • anonymous
No it doesn't give the correct answer and it doesn't jive with interest payments. The interest accrues and then you pay off the interest plus a portion of the principle. I also checked my answer in excel and it is correct.
TuringTest
  • TuringTest
what are the inputs for balance and interest that you are trying to get the answer 29643.05 from?
anonymous
  • anonymous
Ah that's it, I was entering in .02 instead of .2 -- I did the program right. Thanks!
TuringTest
  • TuringTest
congrads lol

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