4) A company has started selling a new type of smartphone at the price of $130 0.05x where x is the number of smartphones manufactured per day. The parts for each smartphone cost $50 and the labor and overhead for running the plant cost $6000 per day. How many smartphones should the company manufacture and sell per day to maximize prot? 5) A rancher wants to construct two identical rectangular corrals using 300 ft of fencing. The rancher decides to build them adjacent to each other, so they share fencing on one side. What dimensions should the rancher use to construct each corral so that together, they will enclose the largest possible area