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 400 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 correct choice from the following options.
A) 2880. B) 4860. C) 5780. D) 5760. E) 6380.
Efficiency per machine = 400 watt/hr   Efficiency due to increase in wind speed = 400*120% =&gt; 480 watt/hr   Production by each machine in 2 hours is  480*2= 
<gadget id="calculator"> 480*2</gadget>
<output>960</output>
&gt; 960 watt   Production by 3 machines=&gt; 960 watt * 3 = 2880 watt   2880.nswer will be (2880.)
<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 400 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?