Clearview window company manufactures windows for the home-building industry. the window frames are produced in the frame division. the frames are then transferred to the glass division, where the glass and hardware are installed. the company’s best-selling product is a three-by-four-foot, doublepaned operable window. the frame division also can sell frames directly to custom home builders, who install the glass and hardware. the sales price for a frame is $175. the glass division sells its finished windows for $480. the markets for both frames and finished windows exhibit perfect competition. the standard variable cost of the window is detailed as follows: