def get_area_average(arr, start_row, start_col, width, height):
    """
    Return average value of area. Sizes of area are in cell_size

    :param arr: array
    :param start_row: int
    :param start_col: int
    :param width: int
    :param height: int
    :return: float

    >>> get_area_average([[[100, 100, 100], [200, 200, 200]], [[200, 200, 200], [100, 100, 100]]], 0, 0, 2, 2)
    450
    """
    average = 0
    for row in range(start_row, start_row + height):
        for col in range(start_col, start_col + height):
            for i in range(3):
                average += int(arr[row][col][0])
    average = int(average // (width * height))
    return average