Prolog Rules Reflect Strucutre

Question

Hello to all, i need to design a rules which test a loan is a car loan or not.

carLoan(flexiCar,minLoanAmount(20000),maxTenure(12) ).
iscarloan(X, Y, Z) :- carLoan(X, Y >= minLoanAmount(20000), Z =<(maxTenure(12)) ).
iscarloan(X, 25000, 10).

I need to test the Y and Z variable against the structure from the fact inside the rule.

How to achieve that ?

Thanks.

Answer 1

iscarloan(X, Y, Z) :-
  carLoan(X, minLoanAmount(MinLoan), maxTenure(MaxTenure)),
  Y >= MinLoan,
  Z =< MaxTenure.

It that what you had in mind?

Answer 2

carLoan(flexiCar, minLoanAmount(20000), maxTenure(12)).

iscarloan(X, Y, Z) :-
    Y = minLoanAmount(MLA),
    Z = maxTenure(MT),
    MLAN is MLA,
    MTN is MT,
    MLAN >= 20000,
    MTN =< 12.

iscarloan(X, 25000, 10).