Question

The length of a rectangle is increased by $10\%$ while its breadth is decreased by $10\%$. What is the consequent percentage change in the area of the rectangle?

Answer 1

As length is increased by $10\%$ and breadth is decreased by $10\%$

Then new area will be$=110\%l\times 90\%\times b=99\%lb$

So,$\%$ change$=100\%-99\%=1\%$