input: Write a python function to calculate the power demand using utilization rate, time, and power, and verify the calculations.
  assert calculatePowerDemand(0.1, 10, 100) == 100.0
  assert calculatePowerDemand(0.5, 5, 200) == 500.0
  assert calculatePowerDemand(1, 1, 1) == 1
output: def calculatePowerDemand(utilization_rate, time, power):
      return utilization_rate * time * power