The demand, D, for a new rollerball pen is given by

The demand, D, for a new rollerball pen is given by D = 0.007p3 - ().3p2 + 150p, where p is the price in dollars. a) Find the rate of change of quantity with respect to price, dDIdp. b)How many units will consumers want to buy when the price is $25 per unit? c) Find the rate of change at p = 25, and interpret this result. d)Would you expect ledp to be positive or negative? (Round to the nearest integer as needed.) c) The number of consumers who wants to buy will |:| by B when the price is $D per unit. (Round to the nearest integer as needed.) d) Would you expect dDIdp to be positive or negative? 0 positive 0 negative