A 17-19" monitor uses about 100-150 W when on, dropping to 10 W or less when in standby.
I'd estimate a PC base-unit like that described to use about 150-200 W
A worst-case estimate based on these figures comes to about 9 units (kWh) per 24 hours. Electricity prices vary, but in the UK I currently pay about 6p per unit (9 cents), which works out to about US $0.80 per day.
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