Power saving (in %) of a bulb is directly proportional to square root of its efficiency. By how much % is power saving of bulb-1(efficiency 0.8) greater than power saving of bulb-2 (efficiency 0.2)?	Choose the correct choice from the following choices
A) 60%  B) 70%  C) 80%  D) 90%  E) 100%
Power, P1=k∗sqrt(0.8)   Power, P2=k∗sqrt(0.2)   Difference = P1−P2=k∗sqrt(0.8)−k∗sqrt(0.2)   % greater =k∗sqrt(0.8)−k∗sqrt(0.2)/k∗sqrt(0.2)∗100   = 100%.   Hence, 100%
<result>E</result>
Power saving (in %) of a bulb is directly proportional to square root of its efficiency. By how much % is power saving of bulb-1(efficiency 0.8) greater than power saving of bulb-2 (efficiency 0.2)?