*1. Python3 program to add two numbers*

num1 = 15
num2 = 12

# Adding two nos

sum = num1 + num2

# printing values

print("Sum of {0} and {1} is {2}" .format(num1, num2, sum))


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2. program to find simple interest for given principal amount, time and rate of interest.

  

# We can change values here for
# different inputs

P = int(input())
R = int(input()) 
T = int(input())

# Calculates simple interest 

SI = (P * R * T) / 100

# Print the resultant value of SI 

print("simple interest is", SI)

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3.Find the factorial of given number

def factorial(n):

    if n < 0:

        return 0

    elif n == 0 or n == 1:

        return 1

    else:

        fact = 1

        while(n > 1):

            fact *= n

            n -= 1

        return fact

num = 5;

print("Factorial of",num,"is",

factorial(num))

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