I want to develop a calculator that does simple math using Python with user input for one of my projects for high school, but I can't figure out how to write the input for percentage. So I was hoping that someone could assist me.

Here is my code---

import math

print("What kind of operation do you want to perform? ")
print("a. Add")
print("b. Subtract")
print("c. Multiply")
print("d. Divide")  
print("e. Square Root")
print("f. Percentage")
print("Please select by choosing a, b, c, d, e, or f.")

def add(ip1, ip2):
  return ip1 + ip2

def subtract(ip1, ip2):
  return ip1 - ip2

def multiply(ip1, ip2):
  return ip1 * ip2

def divide(ip1, ip2):
  return ip1 / ip2

def squareroot(ip1):
  return math.sqrt(ip1)

def percentage(ip1)
  return    

def main():
  option = (input("Choose the sort of calculation you want to perform: "))

  ip1 = int(input("Start by entering the first number you'd want to calculate: "))
  ip2 = int(input("Fill in the second number you want to calculate: "))

 
  if option == "a":
    print(ip1, "+", ip2, "=", add(ip1, ip2))

  elif option == "b":
    print(ip1, "-", ip2, "=", subtract(ip1, ip2))
  elif option == "c":

    print(ip1, "*", ip2, "=", multiply(ip1, ip2))

  elif option == "d":
    print(ip1, "/", ip2, "=", divide(ip1, ip2))

  elif option == "e":
    print(squareroot(ip1))

  else:
    print("Wrong Input")


main()