input: Write a python function to calculate simple interest.
  assert calculateSimpleInterest(1000, 5, 2) == 100.0
  assert calculateSimpleInterest(1500, 4.5, 3) == 202.5
  assert calculateSimpleInterest(2000, 0, 5) == 0
output: def calculateSimpleInterest(principal, rate, time):
      return (principal * rate * time) / 100