How many cost get in to the train if I want to go from NJ Penn Station to NY Penn Station?

$5 each way on NJT which takes roughly 15 minutes or so and is a two stop gig. Plan B ...the Path Train for $2.75 each way. This option takes approximately 45 minutes to 34th Street and you have to transfer at Journal Square. You can also remain on the Path directly to the World Trade Center which is about a 22 minute trip. There you can transfer to all points in the city via MTA subway.

Thanks a lot guys you are the best

Depends on what carrier you use. Amtrak is more expensive than commuters but more comfortable