1 Unit = 1kwh. 600/136 = 4,41Rs INR/kWh. 4,41 x 115 = 507Rs INR in one month without the monitor. This, of course, is not precise, because your computer is consuming more electricity when it's doing intensive work, and less when it's idling.
About 115kWh in a month (22 hours each day, since you said that you turn it off every 10 hours) for the whole pc. I didn't count in the monitor, since you said that you turn it off. Now just multiply it with the price you are paying for a kWh.
Power supplies don't really consume their maximum wattage all the time. Checking with a psu calculator would be more accurate. Just google "power supply calculator".
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