Question

If the side of the square is increased by $30\%$, then the area is increased by :

• A. $9\%$
• B. $27\%$
• C. $30\%$$
• D. $69\%$

Answer 1

The correct option is D $69\%$

Let side $=10cm$

New side $=(10\times \frac{130}{100})=13cm$

Original area $=(10\times 10)=100c{m}^2$

New area $=13\times 13=169c{m}^2$

Increase in area $=69\%$