How many methods are there for the valuation of ending inventory?Explain each of them with the help of accounting principle involved in it.

Please always start your own thread for your question rather than tagging onto someone else's. The thread you grabbed was four years old and not even remotely related in topic. I've moved yours to its own thread.

Then also please see the guidelines about posting homework questions in the red print at the top of this forum.

There are numerous ways to value inventory, which doesn't say anything about what all of them you might have to learn. You should easily be able to find the methods you're to learn in the chapter in your text. As for explaining them, give that a shot and someone can check it for you.