Suppose that the price p in dollars and the number of sales x of a certain item are related by 4p 4x 2px 72 If p and x are both functions of time measured in days Find the rate at which x is Changing when x 3 p 6 and dp dt 1 1 The rate at which x is changing is Round to the nearest hundredth as ne day s per sale day s sale s sale s per day