The side of the square is 15 m. By what percentage will the area increase if its side is increased by 3 m?

1) Determine the starting area of the square.

We multiply its two sides together.

15 * 15 = 225 m2

2) Find the length of the new side of the square.

To do this, add another 3 meters to the length of the initial side.

We get:

15 + 3 = 18 meters.

3) Find the area of the new square.

18 * 18 = 324 m2

4) Determine the difference between the areas of the new and the initial square.

324 – 225 = 99 m2

5) We find by what percentage the area of the square has increased.

To do this, divide the area difference by the initial value and multiply it by 100%.

99/225 * 100 = 9900/225 = 44%.

Answer:

44%.