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Python Programming

You are a consultant doing work for Amy’s Autos, a small car dealership. Amy wants a program that lets her staff enter basic loan data


Project #6 – Amy’s Auto Loan Payments

1          Problem Overview

You are a consultant doing work for Amy’s Autos, a small car dealership. Amy wants a program that lets her staff enter basic loan data (amount, interest rate) and show the potential buyer various financing options, including a report showing a monthly payment breakdown.

2  User Interface

2.1  Initial Input

The user is first asked for the loan amount and annual interest rate: Enter loan amount, example 10000:

20000 Enter annual interest rate, example 2.9:  

These are used for all further calculations.

2.2 Input Menu

The user is then shown a menu offering various loan terms from which they can choose

Amy's Auto - Loan Report Menu


1. 12-month loan
2. 24-month loan
3. 36-month loan
4. 48-month loan
5. 60-month loan
0. EXIT  



2.3          Output

Once the user chooses a loan term option from the menu, they get a nicely formatted report showing one line per payment the buyer will make (abbreviated for space’s sake, here):


Pmt#   PmtAmt   Int Princ Balance
1   1,692.96   48.33 1,644.63 18,355.37
2...   1,692.96   44.36 1,648.60 16,706.77
11 1,692.96 8.15 1,684.81 1,688.90
12 1,692.98 4.08 1,688.90 0.00
Press <Enter> to continue    


Once the user presses <Enter>, the menu of term options is once again displayed.

3          Functions

3.1          Call Hierarchy


  • Specific Functions
Function Name Parameters Returns Description
main none none ·         Calls inputLoanData to gather loan info·         Sets up a loop that calls functions that display the menu and chosen reports·         The loop ends when it sees the menu return a loan term of 0 months
inputLoanData none Loan amount1,Interest rate per period ·         Asks the user for the basic loan info
showMenu none Number of periods ·         In a loop, displays the loan term menu and asks for a user choice·         If the user makes a valid choice, it returns the number of periods·         If the user makes an invalid choice, the menu simply displays again·         If the user chooses the Exit option (choice 0), it returns a loan period of 0 months as a signal to the callingfunction that the user wants out
payment PV, Rate per period2, Numberof periods3 Payment amount ·         Calculates the payment as shown in the Calculations section below
showReport PV, Rate per period, Number of periods, Payment amount None ·         Displays an attractive, aligned report showing the payment breakdown (which it calculates as shown below)·         After the report, displays a message asking the user to press <Enter> to continue


1 This is also used as PV, the present value of the loan.

2 This is also known as the periodic interest rate.

3 We’re talking about monthly payments, so for our purposes “periods” = “months” throughout this project.


4  Calculations

Here are the key calculations you’ll need to use:

  • Payment Amount is calculated using this formula: where PV is Present Value of the loan, r = rate per period (see Hints below), and n is the number of periods. Round to the nearest


𝑃 = 1 − (1 + 𝑟)−𝑛

Adjust the last payment, principal, and balance to take care of any small amount left after the last payment has been calculated (note the last line of the report above). Sum the payments and display that result at the bottom of the report (as shown above).

  • Interest for a specific monthly payment is calculated by taking the current loan balance and multiplying by the rate per period, rounded to the nearest
  • Principal is calculated by taking the Payment Amount and subtracting the Interest
  • Balance is calculated by taking the old loan balance and subtracting the Principal


5  Code Specifications

  • At the bottom of the program you should have a call to main().
  • Include header comments at the top of each file. Include your name, the date, and a brief description of what the program
  • Include comments for each section saying what’s going on in the lines of code
  • Use comments elsewhere as you think they help guide the reader. Don’t overdo, though! Not

every line needs a comment; think about describing a block of related code.

  • Use blank lines to separate sections and provide visual “breathing ”
  • Use descriptive variable


6          Hints

  • The report needs to look nice. Note the formatting in the sample; replicate that or do better if

you’re up for the challenge. Don’t use tabs and spaces for alignment; you know better, now.

  • The user-entered interest rate is typed in human-readable notation; you’ll need to alter it before using it in loan calculations, e.g., converting 2.9 to .029 for math purposes. Also note that this is an annual rate; that’s not what the formulas may want, so another operation will also be needed to get the rate per
  • You should end up with two while loops and one for loop in the
  • Your report function needs something like a “running total” as the loan balance keeps decreasing as payments are made. It also needs an actual running total (of payments).
  • Use exactly the call hierarchy shown (though you can create helper functions); do not chain! Helper functions are


7  Testing

  • Develop an appropriate number of test
  • Document your testing and results in comments at the bottom of the program as shown


8 Summary

At the bottom of your program, add comments that answer these questions:

  • How did you approach this assignment? Where did you get stuck, and how did you get unstuck?
  • How did you test your program? What doesn’t work as you’d like, perhaps things that you’d like

to fix as you learn more?

  • What did you learn from this assignment? What will you do differently on the next project?


9 Grading Matrix

Area Percent
Plain (non-looping) menu 20
Add looping menu 20
Input validation 20
Calculations correct 20
Test cases 10
Internal documentation 5
Summary report 5
Total 100


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