Eighty percent of the lights at Hotel California are on at 8 p.m. a certain evening. However, forty percent of the lights that are supposed to be off are actually on and ten percent of the lights that are supposed to be on are actually off. What percent of the lights that are on are supposed to be off?	Pick one:
A) 22(2/9)%	B) 16(2/3)%	C) 11(1/9)%	D) 10%	E) 5%
a= number of lights supposed to be on   b= number of lights supposed to be off   total = a+b   no of lights that are on = 0.8(a+yb   Light that are supposed to be on but are actually off = 10% of a   Light that are supposed to be on are on = 90% of a   Light that aare supposed to be but are on = 40% of b   Light that aare supposed to be off are off = 60% of b   0.9a + 0.4b = 0.8 (a+b)   a = 4b   Suppose total Lights = 100   so, a = 80 and b = 20   No of lights that are on are on but are supposed to be off = 40% of b = 0.4 (20) = 5   So, the % of lights that are on are supposed to be off = 5/100 = 5%   ANSW5%R:5%
<result>E</result>
Eighty percent of the lights at Hotel California are on at 8 p.m. a certain evening. However, forty percent of the lights that are supposed to be off are actually on and ten percent of the lights that are supposed to be on are actually off. What percent of the lights that are on are supposed to be off?