calculate a bill and separate per person with tip

def bill_per_person(bill, num_of_people, tip):
  bill = float(bill)
  num_of_people = float(num_of_people)
  tip = float(tip)
  bill_total = bill + (bill * (tip/100))
  return bill_total / num_of_people
    
bill_per_person(100, 4, 20)