$2-48$ A university campus has $200$ classrooms and $400$ faculty offices. The classrooms are equipped with $12$ fluorescent tubes, each

consuming $110$ W $,$ including the electricity used by the ballasts. The faculty offices, on average, have half as many tubes. The campus is

open $240$ days a year. The classrooms and faculty offices are not occupied an average of $4$ h a day, but the lights are kept on$.$ If the unit

cost of electricity is $$\frac{0\mathrm{.}11}{k}Wh,$ determine how much the campus will save a year if the lights in the classrooms and faculty offices are

turned off during unoccupied periods.