A windmill is taking advantage of strong air currents in order to produce electrical energy. On a typical day the wind speed is around 20 mph and in that speed the windmill produces 500 kw/h (kilowatts per hour). On a stormy day a windmill produces 20% more energy. How much kw/h can three windmills produce in two hours on a stormy day? Choose the most appropriate option:
A) 3600. B) 4860. C) 5780. D) 5760. E) 6380.
Efficiency per machine = 500 watt/hr   Efficiency due to increase in wind speed = 500*120% =&gt; 600 watt/hr   Production by each machine in 2 hours is  600*2= 
<gadget id="calculator"> 600*2</gadget>
<output>1_200</output>
&gt; 1200 watt   Production by 3 machines=&gt; 1200 watt * 3 = 3600 watt   3600.nswer will be (3600.)
<result>A</result>
A windmill is taking advantage of strong air currents in order to produce electrical energy. On a typical day the wind speed is around 20 mph and in that speed the windmill produces 500 kw/h (kilowatts per hour). On a stormy day a windmill produces 20% more energy. How much kw/h can three windmills produce in two hours on a stormy day?