# 1. Introduction

Simple interest is a quick and easy method of calculating the interest charge on a loan. Simple interest is determined by multiplying the daily interest rate by the principal by the number of days that elapse between payments. This concept is fundamental in finance and is often one of the first lessons in financial literacy. This blog post will guide you through creating a Python program to calculate simple interest based on principal, rate, and time.

# 2. Program Steps

1. Prompt the user to input the principal amount, the rate of interest per annum, and the time period in years.

2. Calculate the simple interest using the formula Simple Interest = (Principal * Rate * Time) / 100.

3. Display the calculated simple interest to the user.

# 3. Code Program

``````# Step 1: Get user input for principal, rate, and time
principal = float(input("Enter the principal amount: "))
rate = float(input("Enter the rate of interest per annum (%): "))
time = float(input("Enter the time period in years: "))

# Step 2: Calculate simple interest
simple_interest = (principal * rate * time) / 100

# Step 3: Display the simple interest
print("The simple interest is:", simple_interest)

``````

### Output:

```Enter the principal amount: 1000
Enter the rate of interest per annum (%): 5
Enter the time period in years: 2
The simple interest is: 100.0
```

### Explanation:

1. The program begins by asking the user for the principal amount, the interest rate per annum (as a percentage), and the time period for the loan or investment in years. These inputs are captured using the input function and converted to floating-point numbers with the float function to ensure that they can be used in mathematical calculations.

2. It calculates the simple interest using the formula Simple Interest = (Principal * Rate * Time) / 100. This formula multiplies the principal amount by the annual interest rate and the time period in years, then divides the product by 100 to convert the interest rate from a percentage to a decimal.

3. Finally, the calculated simple interest is printed out to the console, informing the user of the interest amount that will be charged or earned over the specified period.