Missing part
40 new subscribers joined.....
Answer:
$1150
Step-by-step explanation:
Initially, the number of subscribers was 200 and when 10 cancel their subscription, the remaining subscribers will be 200-10=190 subscribers. Since 40 more also subscribe, then the total subscribers will be 190+40=230 subscribers.
Now since each subscriber pays $5 monthly then for that month, the earning will be $5*230 subscribers=$1150.
Therefore, for that month, the earnings will be $1150