The actual area of a rectangle is 60 Cm2, but while measuring its length a student decreases it by 20% and the breadth increases by 25%. The percentage error in area, calculated by the student is : Select:  A) 5%  B) 15%  C) 20%  D) No change  E) None of these
Solution: 100 ---- 25% ↑ ---&gt; 125 ----- 20% ↓ -----&gt; 100.   So there is no change in the area of rectangle.   Alternatively :   Let area be 1.   Area of rectangle,   = l *b   = 0.8 *1.25= 
<gadget id="calculator">0.8 *1.25</gadget>
<output>1</output>
1.   Answer: Option No change
<result>D</result>
The actual area of a rectangle is 60 Cm2, but while measuring its length a student decreases it by 20% and the breadth increases by 25%. The percentage error in area, calculated by the student is :