The height of a room to its semi-perimeter is 2:5. It costs Rs.260 to paper the walls of the room with paper 50cm wide at Rs.2 per meter allowing an area of 15 sq.m for doors and windows. The height of the room is:	Select the correct option:
A) 2.6m
B) 3.9m
C) 4m
D) 4.2m
E) 4.4m
Let, height= 2x metres &amp; (length+ breadth)= 5x metres.   Length of paper= (260/2)= 
<gadget id="calculator">(260/2)</gadget>
<output>130</output>
130m.   Therefore, area of paper= (130*50/100)= 
<gadget id="calculator">(130*50/100)</gadget>
<output>65</output>
65m2   Area of 4 walls= (65+15)= 
<gadget id="calculator">(65+15)</gadget>
<output>80</output>
80m2   2(length+breadth)*height=80.   Therefore, 2*5x*2x=80 or x2=4 or x=2   Therefore, height of the room= 4m   ANSWER:4m
<result>C</result>
The height of a room to its semi-perimeter is 2:5. It costs Rs.260 to paper the walls of the room with paper 50cm wide at Rs.2 per meter allowing an area of 15 sq.m for doors and windows. The height of the room is: