input: 
  def compoundInterest(investment_amount: float, rate_of_interest: float, time: int) -> float:
      """Calculate the compound interest given the initial investment amount, the rate of interest per period, and the number of periods.
      >>> compoundInterest(1000, 5, 5)
      1276.2815625000003
      >>> compoundInterest(500, 3, 10)
      671.9581874999999
      """
  
output:     return investment_amount * (1 + rate_of_interest / 100) ** time