A product is introduced into the market. Suppose a product's sales quantity per month q(t ) is a function of time t in months is given by q(t) = 5000t - 160t And suppose the price in dollars of that product, p(t), is also a function of time t in months and is given by p(t) = 160 - t2 A. Find, R' (t), the rate of change of revenue as a function of time t expanding and collected not required B. What is the the rate of change of revenue with respect to time 7 months after the introduction