input: Write a python function to round each item in a provided list of numbers, then display the total sum of these rounded numbers multiplied 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(lst):
      rounded_list = [round(num) for num in lst]
      total_sum = sum(rounded_list)
      return total_sum * len(lst)