{ Financial functions }
function FutureValue(ARate: Float; NPeriods: Integer;
APayment, APresentValue: Float; APaymentTime: TPaymentTime): Float;
function InterestRate(NPeriods: Integer; APayment, APresentValue, AFutureValue: Float;
APaymentTime: TPaymentTime): Float;
function NumberOfPeriods(ARate, APayment, APresentValue, AFutureValue: Float;
APaymentTime: TPaymentTime): Float;
function Payment(ARate: Float; NPeriods: Integer;
APresentValue, AFutureValue: Float; APaymentTime: TPaymentTime): Float;
function PresentValue(ARate: Float; NPeriods: Integer;
APayment, AFutureValue: Float; APaymentTime: TPaymentTime): Float;