<Dl> <Dd> Principal × i = C (\ displaystyle (\ text (Principal)) \ times i = C) </Dd> <Dd> Principal = C / i + g o a l (\ displaystyle (\ text (Principal)) = C / i+ (goal)) </Dd> </Dl> <Dd> Principal × i = C (\ displaystyle (\ text (Principal)) \ times i = C) </Dd> <Dd> Principal = C / i + g o a l (\ displaystyle (\ text (Principal)) = C / i+ (goal)) </Dd> <P> Note that no money enters or leaves the combined system of endowment principal + accumulated annuity payments, and thus the future value of this system can be computed simply via the future value formula: </P>

C/r is the formula for the present value of an