Why does my Python algorithm return None instead of the expected result

I am implementing a simple algorithm in Python to perform a basic calculation, but I am getting `None` as the output instead of the expected result. In my function, the logic correctly computes the value, but when I call the function and print its output, it returns `None`. I want to understand why this happens in Python, how the absence of a `return` statement affects the result of an algorithm, and what the correct way is to return values from a function. Since I am still learning Python, a clear and simple explanation would be appreciated.