Arif, You can google search the cost of replacement digitizer screen prices very quite a bit, just be sure to check the sellers ratings before ordering. Links below show process and tools required to change the screen.
Check the attached links,instruction and guides, Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
https://www.youtube.com/watch?v=r5XHrmWYEyY
https://www.youtube.com/watch?v=6DSPBb76H2w
https://www.youtube.com/watch?v=UT_UiHIwCW8
https://www.amazon.com/Tablet-Digitizer-Screen-Replacement-andriod/dp/B00IQOAVZ6