Apple Charge me 255.95 USD ( tax) for repair my iPad 2 Wi-Fi.

Apple Charge me 255.95 USD ( tax) for repair my iPad 2 Wi-Fi.

The only problem about my iPad is no sound, why they charge so much?

And why apple don't even tell me what they are going to do with my iPad 2.

They just want me to pay 255.95 USD.

So, do I have anyways to find out what apple are doing?