Awell-insulated box loses heat to the ambient only through a single-pane glass window of area 1 m2 and thickness 0.5 em. the ambient medium is at 10°c, and the external heat transfer coefficient is 10 w/m2 • k. the interior of the box is maintained at 25°c and is well mixed, giving the window an inside surface temperature of 2soc. at $0.15/kw ·h (kilowatt-hour), what is the annual cost of maintaining this system