Python newbie

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February 21st, 2013, 02:05 PM

upendra_35

Registered User

Join Date: Feb 2013

Posts: 2

Time spent in forums: 10 m 58 sec
Reputation Power: 0

Python newbie

Hi, I am very new to python and i currently had to do an assignment and eventhough i could do most of it but got struck in the middle. I hope i could get some help you finish my assignment. Thanks

Basically i have to write a python program to generate the below:

PHP Code:


		
			
 balance = 4213

              annualInterestRate = 0.2

              monthlyPaymentRate = 0.04

              

              Result Your Code Should Generate:

              -------------------

              Month: 1

              Minimum monthly payment: 168.52

              Remaining balance: 4111.89

              Month: 2

              Minimum monthly payment: 164.48

              Remaining balance: 4013.2

              Month: 3

              Minimum monthly payment: 160.53

              Remaining balance: 3916.89

              Month: 4

              Minimum monthly payment: 156.68

Here is my code for that:

PHP Code:


		
			
 b0 = 4213

print('balance =' + str(b0))

r = 0.2

print('Annual interest rate =' + str(r))

m = 0.04

print('montly payment rate =' + str(m))



Month = 1

while Month <= 4:  

    print('Month:' + str(Month))

    mmp = round(m * b0, 2)

    print('Minimum monthly payment:' + str(mmp))

    ub0 = b0 - mmp

    rb = round(ub0 + (r/12.0 * ub0), 2) 

    print('Remaining balance:' + str(rb))

    Month = Month + 1    

    print('Month:' + str(Month))  

    mmp = round(m * rb, 2)

    print('Minimum monthly payment:' + str(mmp))

    ub0 = rb - mmp

    rb = round(ub0 + (r/12 * ub0), 2)

    print('Remaining balance:' + str(rb))

    Month = Month + 1

When i run the above i am getting the following:

PHP Code:


		
			
 balance =4213

Annual interest rate =0.2

montly payment rate =0.04

Month:1

Minimum monthly payment:168.52

Remaining balance:4111.89

Month:2

Minimum monthly payment:164.48

Remaining balance:4013.2

Month:3

Minimum monthly payment:168.52

Remaining balance:4111.89

Month:4

Minimum monthly payment:164.48

Remaining balance:4013.2

Total paid:199.8

Remaining balance:4013.2

As you can see i got only two months correct but after that the last two months have the same values as the first two months. Could somebody point to me where i am going wrong.

Thanks
Upendra

February 22nd, 2013, 12:58 AM

dwblas

Contributing User

Join Date: May 2009

Posts: 412

Time spent in forums: 5 Days 5 h 27 m 28 sec
Reputation Power: 32

You always subtract the payment from the original balance (b0) on each pass through the loop

Code:

b0 = 4213 
print('balance =' + str(b0)) 
r = 0.2 
print('Annual interest rate =' + str(r)) 
m = 0.04 
print('montly payment rate =' + str(m)) 
min_payment=round(m * b0, 2) 
remaining_balance=b0
Month = 1 
while Month <= 4:   
    print('\nMonth:' + str(Month)) 
    print('Minimum monthly payment:', min_payment) 
    remaining_balance -= min_payment
    print('Remaining balance:', remaining_balance) 
    Month = Month + 1

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