input: Write a python function to calculate the total sum of a list of numbers.
  assert calculate_total([2, 4, 5, 6, 8]) == 25
  assert calculate_total([10, 20, 30, 40]) == 100
  assert calculate_total([1, 2, 3, 4, 5]) == 15
output: def calculate_total(numbers):
      return sum(numbers)