Passing values from routes to controller in laravel

I have a route like so

Route::get('/sales/{id}','SalesController@index');

How can I pass extra values to the index function? In my scenerio I want to pass the /sales as well with the {id} from the route.

Here I get only the id for now from the index function.

public function index($id){
    return $id;
}

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