Suppose customers in a hardware store are willing to buy​ N(p) boxes of nails at p dollars per​ box, as given by the following function. N(p)=100 - 3 p^2​; 1 < p < 4 Find the average rate of change of demand for a change in price from ​$2 to ​$3. The average rate of change of demand for a change in price from ​$2 to ​$3 is nothing boxes per dollar. ​(Type an integer or a​ decimal.)