I believe the answer is a sorry if i am incorrect
I think you could use 40 - 2/5w
Answer:
The length of each side of square is 9 cm
Step-by-step explanation:
<u><em>The question in English is</em></u>
The given figure is made up of 6 identical squares.The perimeter of the figure is 126 cm.what is the length of each side of square?
The picture of the question in the attached figure
Let
x ----> the length side of each square
we know that
The perimeter is the sum of the borders of the figure
so
In this problem

see the attached figure N 2 to better understand the problem
we have

so

solve for x

therefore
The length of each side of square is 9 cm
we know that
the amount
-------> represent the 
so
<u>Find the percentage of the amount
</u>
by proportion

<u>Find the percentage gain</u>

therefore
<u>the answer is</u>
The percentage gain on the investment is 