pls help me of this question

Answers
First Question :
• According to given question :
Second Question :
• According to given question :
Questions -
1. The area of a square garden is 400 square metres .
What is the cost of fencing the garden at a rate of Rs. 4 per metre ?
2. If the length of each side of the square is increased by 10% , than what will be the percentage of increase in area ?
Solution -
- Part 1
In the above Question , we have the following information -
The area of a square garden is 400 square metres .
We have to find the cost of fencing the garden at a rate of Rs. 4 per metre .
Let the length of the edge of the square garden be X metres .
Area of the square garden = 400 square metres
=> x^2 = 400
=> x = 20 m
So, the side of the square garden is 20 m.
Perimeter of the garden -
=> 4 × Side
=> 80 metres .
Cost of fencing the garden at a rate of Rs. 4 per metre -
=> Rs. 320 .... A 1
- Part 2
Let the innitial length of the square be l metres .
Now, this is increased by 10 %
Hence ,
New length of side of the square is 1.1 m.
Area of square
=> [ Length ]^2
=> 1.21 l^2
Therefore , Increase in area = 0.21 L^2 = 21%