Use the price-demand equation below to find the revenue function. Sketch a graph of the revenue function, and indicate the regions of inelastic and elastic demand. x= f(p)=54-6p R(p)= Which graph below is the graph of the revenue function? OA. AR(p) 20 OB. C. D. AR(P) AR(P) AR(P) 59 650- 650- Q 470 G -20 -10 Region A in the graph of the revenue function is Region B in the graph of the revenue function is neither elastic or inelastic elastic 85 4 85