Summary Todayn periodsFutureTypeFormula Discount value by r each period$FVSimple PVPV = Fvfactor * FV $PVReceive return r each period Simple FVFV = PVfactor * PV Receive $PMT each period-Simple AnnuityPV = PMT * (1 – present value factor) / r -Invest $PMT each period Balance earns r each period Compound Annuity FV = PMT * (future value factor – 1) / r Receive $PMT forever-PerpetuityPV = PMT / r