input: Write a python function to find the key with the maximum value in a dictionary.
  assert findMax({'A': 12, 'B': 17, 'C': 3}) == ('B', 17)
  assert findMax({'apple': 4, 'banana': 10, 'cherry': 7}) == ('banana', 10)
  assert findMax({'x': 5, 'y': 5, 'z': 5}) == ('x', 5)
output: def findMax(d):
      max_key = max(d, key=d.get)
      return (max_key, d[max_key])