I need help desperately with this problem of thermodynamics. I will rate instant

Question

I need help desperately with this problem of thermodynamics. I will rate instantly. PLEASE provide a detailed explanation of steps. THANKS!

An engineering classroom is equipped with 70 fluorescent tubes, each consuming 110 W, including the electricity used by the ballasts. The engineering faculty offices, on average, have 12 tubes. Consider an engineering building with 20 classrooms and 200 faculty offices. 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 $0.092/kWh, determine how much the campus will save a year if the lights in the classrooms and faculty offices are turned off during unoccupied periods.

Explanation / Answer

total energy wasted per second

                             = 70*110*20 + 12*110*200

                              = 418000 W

For a year, it will be = 418000*4*240

                               = 401280 kWh
Money saved = 401280 * 0.092

                                 = $ 36,917.76

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