The monthly demand for a certain brand of table wine is given by the demand equation p = 360   1 −  3 3 + e−0.0005x   where p denotes the wholesale price per case (in dollars) and x denotes the number of cases demanded. (a) Find the rate of change of the price per case when  x = 1000. (a) Find the rate of change of the price per case when  x = 1000.