Need help with part a and b

For the following demand function, find a. E, and b. the values of q (if any) at which total revenue is maximized. q=40,600 - 4p- a. Determine the elasticity of demand, E. E = (Type an expression using p as the variable.) b. Determine the value of q that maximizes the revenue. Select the correct choice below, and if necessary, fill in the answer box within your choi O A. Total revenue is maximized at about q = (Round to the nearest whole number as needed.) B. No values of q maximize total revenue