input: Write a python function to compute the compound interest.
  assert compute_CI(1000, 5, 10) == 1628.894626777442
  assert compute_CI(1500, 4.3, 6) == 1938.8368221341054
  assert compute_CI(2000, 3.5, 7) == 2561.597970498113
output: def compute_CI(principal, rate, time):
      return principal * (1 + rate / 100) ** time