def ltv_predict(data, mbg, ggf, discount_rate, time):
    """
    Predict dollar value of customers from today up to time t.
    """
    return ggf.customer_lifetime_value(mbg,
                                       data['frequency_cal'],
                                       data['recency_cal'],
                                       data['T_cal'],
                                       data['monetary_value'],
                                       time=time,
                                       discount_rate=discount_rate)