For the following demand function, find a. E, and b. the values of q (if any) at which total revenue is maximized. -0.39 p= 800 e a. Find the elasticity of demand (E) in terms of q. E(9) b. Find the values of q (if any) at which total revenue is maximized. Select the correct choice below, and if necessary, fill in the answer box within your choice. q A. Revenue is maximized at q = (Type an integer or a simplified fraction.) OB. No values of q maximize revenue