Python Challenge: Compound Interest Calculator

Practity 20 January, 2024 33 0

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Python Mini Challenge with Solutions

Compound Interest Calculator

Description

In this Python mini challenge with solutions you will have to build a compound interest calculator. Your task is to create a Python program that calculates the future value of an investment based on the principal amount, interest rate, and compounding period. It is a useful tool for individuals who want to estimate the growth of their investments over time.

The program will work as follows: First it will ask the user to enter the data: Principal amount, the interest rate and the time period. Then it will apply the compund interest formula (see below) and display the result.

Expected output

Enter the principal amount: 1000
Enter the interest rate (in decimal form): 0.05
Enter the number of years: 5

Future Value: $1276.28

Steps

1) Create a new Python file

Open your code editor or IDE and create a new Python file (e.g., compound_interest_calculator.py).

2) Define the main function

Start by defining the main function that will contain the logic of the compound interest calculation.

3) Gather user input

Prompt the user to enter the principal amount, interest rate (in decimal form), and the number of years for the investment.
Use the "input()" function to capture the user’s input and store them in appropriate variables.

4) Calculate the compound interest

Use the compound interest formula to calculate the future value of the investment yearly:
Future Value = Principal Amount * (1 + Interest Rate/Compounding Period)^(Compounding Period * Number of Years)
Store the result in a variable.

5) Display the result

Print the calculated future value of the investment to the console.
Format the output to make it more user-friendly.

6) Test the program

Run the Python script and test the compound interest calculator by entering different values for the principal amount, interest rate, and number of years.

Python challenge solutions


def compound_interest(principal, rate, time):
    amount = principal * (1 + rate / 100) ** time
    return amount

def main():
    principal = float(input("Enter the principal amount: "))
    rate = float(input("Enter the annual interest rate (in percentage): "))
    time = float(input("Enter the time period (in years): "))

    amount = compound_interest(principal, rate, time)

    print(f"The compound interest amount is: {amount:.2f}")

if __name__ == "__main__":
    main()

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