The number of subscribers in a small community to a cable TV provider company is linearly related to the price. If the rental price is $30, there will be 5 thousand subscribers, but if the price is raised to $35 there will be a decrease of 1 thousand subscribers. Suppose the current price is $30, and the price is rising at $1.00 per month. Find the rate at which the revenue is changing at this time.
The number of subscribers in a small community to a cable TV provider company is linearly related to the price.
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