input: Write a function that rounds each element in a given list of numbers, sums them up and then multiplies the total by the length of the list.
  assert round_and_sum([22.4, 4.0, -16.22, -9.10, 11.00, -12.22, 14.20, -5.20, 17.50])==243
  assert round_and_sum([5,2,9,24.3,29])==345
  assert round_and_sum([25.0,56.7,89.2])==513
output: def round_and_sum(numbers):
      total = sum(round(num) for num in numbers)
      return total * len(numbers)