company One PC spends average 400 watt energy.
That is 0.4 kWatt per hour.
24x0.4 = 9.6 kWatt per day.
1 kWatt electricity is 0.095 $
Daily cost 9.6x0.095 = 0.912 $
Monthly cost 30x0.912 = 27.36 $
Yearly cost 12x27.36 = 328.32 $