The annual revenue and cost functions for a manufacturer of precision gauges are approximately r(x)=520x-0.02x^2 and c(x)=200x+100,000,where x denotes the number of gauges. what is the maximum annual profit?

Which best describes a central bank's primary goals? limiting inflation and reducing unemployment reducing unemployment and maintaining cash flow controlling stagflation and reducing unemployment managing credit and ensuring the money supply's liquidity