Clueless on how electricity works, let alone the cost of it....!

Just curious, below are the specs of my setup. Any idea what it would cost to leave running for 12 hours?
Total module power: 3,873 mA +12v / 1,749 mA -12v / 92 mA +5V
The case I have will take up to 8000/3200 mA
The average electricity rate in my area is 19.74¢ per kWh