Solution: (1) If you rent X A-class cars, you rent (8-x) B-class cars, depending on the meaning of the question.

4x+2(8-x)≥30，3x+8(8-x)≥20，

Solution: 7≤x≤44/ 5,

∴x is a positive integer, and ∴x can only be 7,8. That is to say, * * * has two car rental schemes:

① Rent 7 Class A cars, 1 Class B car.

(2) Eight A-class cars are rented.

(2) The rental fee of Scheme I is 7×8000+ 1×6000=62000.

In the second scheme, the rental fee is 8×8000=64000.

∵62000