The length of a rectangle is reduced by 20%. By what % would the width have to be increased to maintainthe original area?  Select the correct option
A) 10%  B) 20%  C) 25%  D) 30%  E) 45%
Sol. Required change = (20*100)/(100-20)= 
<gadget id="calculator">(20*100)/(100-20)</gadget>
<output>25</output>
25%   25%
<result>C</result>
The length of a rectangle is reduced by 20%. By what % would the width have to be increased to maintainthe original area?