CONSUMER DEMAND When a certain commodity is sold for p dollars per unit, consumers will bu...

CONSUMER DEMAND When a certain commodity is sold for p dollars per unit, consumers will buy units per month. It is estimated that t months from now, the price of the commodity will be p(t) = 0.4t3/2 +6.8 dollars per unit. At what percentage rate will the monthly demand for the commodity be changing with respect to time 4 months from now?