input: Write a function to return an array with the running total of numbers in a given list using numpy. The function should take a single argument, which is the list of numbers, and return the array with the cumulative sums.
  assert np.array_equal(runningTotal([1, 2, 3, 4]), np.array([1, 3, 6, 10]))
  assert np.array_equal(runningTotal([5, 3, 9, 2]), np.array([5, 8, 17, 19]))
  assert np.array_equal(runningTotal([]), np.array([]))
  assert np.array_equal(runningTotal([10]), np.array([10]))
output: import numpy as np
  
  def runningTotal(numbers):
      return np.cumsum(numbers)