def sharpe_calc(rtrn: float, risk: float, rf: float) -> float:
    """
    Calculate the Sharpe Ratio assumed given continuously compounded return.
    :param rtrn: Continuously compounded return.
    :param risk: Standard deviation of portfolio.
    :param rf: Risk free rate of return.
    :return: Sharpe Ratio.
    """
    return (rtrn - rf) / risk