def accuracy_of_forecast_demand(actual_demand, forecast_demand):
    """Return the accuracy of forecast demand.

    Args:
        actual_demand (int): Actual number of units of product sold within the period.
        forecast_demand (int): Number of units forecast to be demanded within the period.

    Returns:
        Accuracy of forecast demand.
    """

    return ((actual_demand - forecast_demand) / actual_demand) * 100