I don't really understand how to get the solution to this. Any help would be appreciated as I need help understanding this concept.

The monthly sales of Sunny Electronics' new sound system are given by q(t) = 2,000t 601'2 units per month, t months after its introduction. The price Sunny charges is p(t) = 1,000 t2 dollars per sound system, t months after introduction. Find the rate of change of monthly sales. HINT [See Example 4(a).] q'U') = Find the rate of change of the price. P'(t) = Find the rate of change of monthly revenue 5 months after the introduction of the sound system. $ per month Interpret your answer. When t = , the revenue is increasing at a rate of $ per month