# How to Find a Simple Interest in Python

In this tutorial, we will program 'How to Find Simple Interest in Python'. We will learn how to calculate simple interest in Python. The main goal here is to create a program that will easily calculate the simple interest for your payments. I will provide a sample program to demonstrate the actual coding of this tutorial.

This topic is very easy to understand; just follow the instructions I provide, and you can also do it yourself with ease. The program I will show you covers the basics of programming for calculating simple interest. I will do my best to provide you with the easiest method of finding the simple interest. So, let's start with the coding.

## Creating Main Function

This is the main function of the application. The following code will display a simple GUI in terminal console that will display program. To do this, simply copy and paste these blocks of code into the IDLE text editor.
`def simple_interest(p,t,r):	print('The principal is', p)	print('The time period is', t)	print('The rate of interest is',r) 	si = (p * t * r)/100 	print('The Simple Interest is', si)	return si   while True:        ret = False         print("====================== Find a Simple Interest in Python ====================== \n\n")          p = int(input("Enter the principal: "))        t = int(input("Enter the time period: "))        r = int(input("Enter the rate of interest: "))        print("\n")          simple_interest(p, t, r)        print("\n")         opt = input("Do you want to update again?(yes/no): ")         if opt.lower() == 'yes':                ret=False        elif opt.lower() == 'no':                ret=True                print("Exiting program....")         else:                print("Please enter yes/no:")                break         if ret == False:                continue`

This Python code calculates and displays the simple interest based on user-provided values for principal amount, time period, and interest rate. It then prompts the user if they want to update the values and continues looping until the user chooses to exit.