If 1 hour cost $9.80 then t hours cost 9.80t dollars. Adding the reservation fee of $48 the total cost is 48 + 9.80t dollars. The film club wants to spend at most
$136.20, then:
48 + 9.80t ≤ 136.20
9.80t ≤ 136.20 - 48
t ≤ 88.2/9.80
t ≤ 9
They can rent the room for at most 9 hours.