i would like to know if is possible see the profit margin of the project

No, it is not displayed, but can be calclated from existing data :
[Profit Margin] = ( [Validate Total Cost] - [Planned Total cost] ) / [Validate Total Cost]

also if Projeqtor have month cost/resource report.

Yes you'll find several reports in the Report menu, under categories "Planning" and "Costs"

Thank you.

I have seen several reports but i havent seen the individual cost of resource per month.
I can see the total resources cost per month or the invidual expense per month but not individual cost resource per month.

These reports display data per resource, but not "for a given resource"
To fit this need, they must be dupplicated wtih extra "resource" parameter.
This could be done thought "evolution service".
Don't hesitate to request for a quote (through Contact form)