Question

The length of rectangle is incresed by 20 percent and breadth by 40 percent. By what percent is area increased

Answer 1

Here comes ur answers.....

Let the length and breadth of rectangle be x and y respectively....

So,area= x*y

After increament in length and breadth,

l= x + x*20/100 = 6y/5

b = y + y*40/100 = 7y/5

Area= 7y/5*6x/5 = 42xy/25

Increase in area = 42xy/25-xy

= 17xy/25

% increase =17xy/25 * 1/xy * 100

= 68%