Each side of a rectangular field diminished by 40%. By how much per cent is the area of the field diminished?	Answers
A) 32
B) 64
C) 25
D) 16
E) None
Solution: Let the Original length of the rectangle be 20 unit and breadth be 10 unit. Then   Original Area = length *breadth = 20*10= 
<gadget id="calculator">20*10</gadget>
<output>200</output>
200 Square unit.   40% decrease in each side, then   Length= (20 - 40% of 20) = 12 unit.   Breadth = (10 - 40% of 10) = 6 unit.   Now, Area = 12 *6= 
<gadget id="calculator">12 *6</gadget>
<output>72</output>
72 Square unit.   Decrease in area= 200 - 72= 
<gadget id="calculator">200 - 72</gadget>
<output>128</output>
128 square unit.   % Decrease in Area= (128/200)*100= 
<gadget id="calculator">(128/200)*100</gadget>
<output>64</output>
64%   Mind Calculation Method:   Let the original area be 100 square unit.   100===40%↓(decrease in length)===&gt; 60 ===40%↓===(decrease in breadth)===&gt; 36.   Diminished in area = 100-36= 
<gadget id="calculator">100-36</gadget>
<output>64</output>
64%   Answer: Option 64
<result>B</result>
Each side of a rectangular field diminished by 40%. By how much per cent is the area of the field diminished?