I need assistance with this to add it in my notes

QUESTION 4 The monthly sales of Sunny Electronics' new sound system are given by q(1) = 6,0001 - 60t units per month, t months after its introduction. The price Sunny charges is p(!) - 3,000 - dollars per sound system, I months after introduction. (a) Find the rate of change of monthly sales. (b) Find the rate of change of price. (c) Find the rate of change of monthly revenue 5 months after the Introduction of the sound system. $ per month