Answer:
35 subscribers
Step-by-step explanation:
Divide $43.75 by $1.25.
$43.75/$1.25 = 35
For each subscriber he gets, his service goes down by $1.25.
Since 35 * $1.25 = $43.75, for 35 new subscribers, his service will go down by $43.75.
He pays $43.75, so if the service goes down by $43.75, he will pay nothing since $43.75 - $43.75 = 0.
Answer: 35 subscribers