Show reports after submitting

Did you mean a consolidated report? The report is usually accessible only to the survey administrators. However, you can show any particular report using the bundled Survey Reports module.  Using loadmodule shortcode, show this module inside any of your article. Add redirect URL of that article in your survey redirect URL option.

https://docs.joomla.org/How_do_you_put_a_module_inside_an_article%3F

I don't know if it's consolidated report. I just wish to have a result with percentage of answers when I click on finish in a survey. For exemple, I have a survey with the question "How are you" and 2 answers "Fine" and "Bad".

When I submit my answer I wish to know how many people said Fine and how many said Bad.

I'm sorry for my English i'm French :)

I hope i'm clear enough

That's a consolidated report. It shows the report of all questions with percentages on the charts. Try the method I mentioned above. Let me know if you need any help.

Ha ok.

The problem is that I'll have a lot of Survey and create one modul by survey will be very hard