def compounded_interest_pv(V_t, r, t, m):
    """The present value of a compounded interest product tries to find the initial sum whose value at time t is given.
       Also called discounted value.

    Parameters
    ----------
    V_t: float
        Future value at time t.
    r: float
        Interest rate
    t: float
        Time, expressed in years.
    m: float
        Compounding period. Amount of payments made per annum.

    """
    return V_t*(1/(1 + r/m)**(t*m))