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 list of numbers as input and return a NumPy array with the cumulative sum at each position.
  assert np.array_equal(runningTotal([1, 2, 3, 4]), np.array([1, 3, 6, 10]))
  assert np.array_equal(runningTotal([5, 10, 15]), np.array([5, 15, 30]))
  assert np.array_equal(runningTotal([0, 0, 0, 1]), np.array([0, 0, 0, 1]))
  assert np.array_equal(runningTotal([]), np.array([]))
output: import numpy as np
  
  def runningTotal(numbers):
      return np.cumsum(numbers)