25 members of the tour group live in the table tennis hall, with 3 rooms and 2 halls. There can't be an empty bed in every room. ) How many different arrangements are there? (in the table.

1 triple room 1 1 double room1×100+1× 80 = 980 yuan.

Three triple rooms, eight double rooms, 3× 100+8×80=940 yuan.

Five triple rooms and five double rooms 5× 100+5×80=900 yuan.

7 triple rooms and 2 double rooms 7× 100+2×80=860 yuan.

There are only four arrangements, at least 860 yuan.