The length of a rectangular plot is 20 metres more than its breadth. If the cost of fencing the plot @ Rs. 26.50 per metre is Rs. 7420, what is the length of the plot in metres?
Options:  A) 20  B) 200  C) 300  D) 400  E) 80
Let length of plot = L meters, then breadth = L - 20 meters   and perimeter = 2[L + L - 20] = [4L - 40] meters   [4L - 40] * 26.50 = 7420   [4L - 40] = 7420 / 26.50= 
<gadget id="calculator">7420 / 26.50</gadget>
<output>280</output>
280   4L= 320   L = 320/4= 
<gadget id="calculator">320/4</gadget>
<output>80</output>
80 meters. Answer: 80
<result>E</result>
The length of a rectangular plot is 20 metres more than its breadth. If the cost of fencing the plot @ Rs. 26.50 per metre is Rs. 7420, what is the length of the plot in metres?