.
The length of the rectangle is five times it’s width.
The area of the rectangle is 500. What is the perimeter ?
~~~~~~~~~~~~~~~~~~~~
The sides are 10 and 50 units.
From this point, complete the solution on your own.
-----------------
Use the form "its" correctly !
"It's" = "it is" and does not work in this context.
You were pointed in it just more than 500 times, but still did not learn it.
It is just time to do it.